19881680

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2731}}^1$

素因数の和:2764

約数の個数: 80

約数和(自身を含む): 56913024

約数和(自身を除く): 37031344

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2731, 3640, 5462, 7280, 10924, 13655, 19117, 21848, 27310, 35503, 38234, 43696, 54620, 71006, 76468, 95585, 109240, 142012, 152936, 177515, 191170, 218480, 248521, 284024, 305872, 355030, 382340, 497042, 568048, 710060, 764680, 994084, 1242605, 1420120, 1529360, 1988168, 2485210, 2840240, 3976336, 4970420, 9940840, 19881680]

約数ペア:

[(1, 19881680), (2, 9940840), (4, 4970420), (5, 3976336), (7, 2840240), (8, 2485210), (10, 1988168), (13, 1529360), (14, 1420120), (16, 1242605), (20, 994084), (26, 764680), (28, 710060), (35, 568048), (40, 497042), (52, 382340), (56, 355030), (65, 305872), (70, 284024), (80, 248521), (91, 218480), (104, 191170), (112, 177515), (130, 152936), (140, 142012), (182, 109240), (208, 95585), (260, 76468), (280, 71006), (364, 54620), (455, 43696), (520, 38234), (560, 35503), (728, 27310), (910, 21848), (1040, 19117), (1456, 13655), (1820, 10924), (2731, 7280), (3640, 5462)]