21781840

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8783}}^1$

素因数の和:8827

約数の個数: 40

約数和(自身を含む): 52282368

約数和(自身を除く): 30500528

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8783, 17566, 35132, 43915, 70264, 87830, 140528, 175660, 272273, 351320, 544546, 702640, 1089092, 1361365, 2178184, 2722730, 4356368, 5445460, 10890920, 21781840]

約数ペア:

[(1, 21781840), (2, 10890920), (4, 5445460), (5, 4356368), (8, 2722730), (10, 2178184), (16, 1361365), (20, 1089092), (31, 702640), (40, 544546), (62, 351320), (80, 272273), (124, 175660), (155, 140528), (248, 87830), (310, 70264), (496, 43915), (620, 35132), (1240, 17566), (2480, 8783)]