21658980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{139}}^1$

素因数の和:218

約数の個数: 144

約数和(自身を含む): 72394560

約数和(自身を除く): 50735580

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 53, 60, 70, 84, 98, 105, 106, 139, 140, 147, 159, 196, 210, 212, 245, 265, 278, 294, 318, 371, 417, 420, 490, 530, 556, 588, 636, 695, 735, 742, 795, 834, 973, 980, 1060, 1113, 1390, 1470, 1484, 1590, 1668, 1855, 1946, 2085, 2226, 2597, 2780, 2919, 2940, 3180, 3710, 3892, 4170, 4452, 4865, 5194, 5565, 5838, 6811, 7367, 7420, 7791, 8340, 9730, 10388, 11130, 11676, 12985, 13622, 14595, 14734, 15582, 19460, 20433, 22101, 22260, 25970, 27244, 29190, 29468, 31164, 34055, 36835, 38955, 40866, 44202, 51569, 51940, 58380, 68110, 73670, 77910, 81732, 88404, 102165, 103138, 110505, 136220, 147340, 154707, 155820, 204330, 206276, 221010, 257845, 309414, 360983, 408660, 442020, 515690, 618828, 721966, 773535, 1031380, 1082949, 1443932, 1547070, 1804915, 2165898, 3094140, 3609830, 4331796, 5414745, 7219660, 10829490, 21658980]

約数ペア:

[(1, 21658980), (2, 10829490), (3, 7219660), (4, 5414745), (5, 4331796), (6, 3609830), (7, 3094140), (10, 2165898), (12, 1804915), (14, 1547070), (15, 1443932), (20, 1082949), (21, 1031380), (28, 773535), (30, 721966), (35, 618828), (42, 515690), (49, 442020), (53, 408660), (60, 360983), (70, 309414), (84, 257845), (98, 221010), (105, 206276), (106, 204330), (139, 155820), (140, 154707), (147, 147340), (159, 136220), (196, 110505), (210, 103138), (212, 102165), (245, 88404), (265, 81732), (278, 77910), (294, 73670), (318, 68110), (371, 58380), (417, 51940), (420, 51569), (490, 44202), (530, 40866), (556, 38955), (588, 36835), (636, 34055), (695, 31164), (735, 29468), (742, 29190), (795, 27244), (834, 25970), (973, 22260), (980, 22101), (1060, 20433), (1113, 19460), (1390, 15582), (1470, 14734), (1484, 14595), (1590, 13622), (1668, 12985), (1855, 11676), (1946, 11130), (2085, 10388), (2226, 9730), (2597, 8340), (2780, 7791), (2919, 7420), (2940, 7367), (3180, 6811), (3710, 5838), (3892, 5565), (4170, 5194), (4452, 4865)]