21041240

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{97}}^1$

素因数の和:165

約数の個数: 128

約数和(自身を含む): 57153600

約数和(自身を除く): 36112360

約数列:

[1, 2, 4, 5, 8, 10, 11, 17, 20, 22, 29, 34, 40, 44, 55, 58, 68, 85, 88, 97, 110, 116, 136, 145, 170, 187, 194, 220, 232, 290, 319, 340, 374, 388, 440, 485, 493, 580, 638, 680, 748, 776, 935, 970, 986, 1067, 1160, 1276, 1496, 1595, 1649, 1870, 1940, 1972, 2134, 2465, 2552, 2813, 3190, 3298, 3740, 3880, 3944, 4268, 4930, 5335, 5423, 5626, 6380, 6596, 7480, 8245, 8536, 9860, 10670, 10846, 11252, 12760, 13192, 14065, 16490, 18139, 19720, 21340, 21692, 22504, 27115, 28130, 30943, 32980, 36278, 42680, 43384, 47821, 54230, 56260, 61886, 65960, 72556, 90695, 95642, 108460, 112520, 123772, 145112, 154715, 181390, 191284, 216920, 239105, 247544, 309430, 362780, 382568, 478210, 526031, 618860, 725560, 956420, 1052062, 1237720, 1912840, 2104124, 2630155, 4208248, 5260310, 10520620, 21041240]

約数ペア:

[(1, 21041240), (2, 10520620), (4, 5260310), (5, 4208248), (8, 2630155), (10, 2104124), (11, 1912840), (17, 1237720), (20, 1052062), (22, 956420), (29, 725560), (34, 618860), (40, 526031), (44, 478210), (55, 382568), (58, 362780), (68, 309430), (85, 247544), (88, 239105), (97, 216920), (110, 191284), (116, 181390), (136, 154715), (145, 145112), (170, 123772), (187, 112520), (194, 108460), (220, 95642), (232, 90695), (290, 72556), (319, 65960), (340, 61886), (374, 56260), (388, 54230), (440, 47821), (485, 43384), (493, 42680), (580, 36278), (638, 32980), (680, 30943), (748, 28130), (776, 27115), (935, 22504), (970, 21692), (986, 21340), (1067, 19720), (1160, 18139), (1276, 16490), (1496, 14065), (1595, 13192), (1649, 12760), (1870, 11252), (1940, 10846), (1972, 10670), (2134, 9860), (2465, 8536), (2552, 8245), (2813, 7480), (3190, 6596), (3298, 6380), (3740, 5626), (3880, 5423), (3944, 5335), (4268, 4930)]