21016760

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{997}}^1$

素因数の和:1056

約数の個数: 64

約数和(自身を含む): 51736320

約数和(自身を除く): 30719560

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 997, 1054, 1240, 1994, 2108, 2635, 3988, 4216, 4985, 5270, 7976, 9970, 10540, 16949, 19940, 21080, 30907, 33898, 39880, 61814, 67796, 84745, 123628, 135592, 154535, 169490, 247256, 309070, 338980, 525419, 618140, 677960, 1050838, 1236280, 2101676, 2627095, 4203352, 5254190, 10508380, 21016760]

約数ペア:

[(1, 21016760), (2, 10508380), (4, 5254190), (5, 4203352), (8, 2627095), (10, 2101676), (17, 1236280), (20, 1050838), (31, 677960), (34, 618140), (40, 525419), (62, 338980), (68, 309070), (85, 247256), (124, 169490), (136, 154535), (155, 135592), (170, 123628), (248, 84745), (310, 67796), (340, 61814), (527, 39880), (620, 33898), (680, 30907), (997, 21080), (1054, 19940), (1240, 16949), (1994, 10540), (2108, 9970), (2635, 7976), (3988, 5270), (4216, 4985)]