21558640

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8693}}^1$

素因数の和:8737

約数の個数: 40

約数和(自身を含む): 51746688

約数和(自身を除く): 30188048

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8693, 17386, 34772, 43465, 69544, 86930, 139088, 173860, 269483, 347720, 538966, 695440, 1077932, 1347415, 2155864, 2694830, 4311728, 5389660, 10779320, 21558640]

約数ペア:

[(1, 21558640), (2, 10779320), (4, 5389660), (5, 4311728), (8, 2694830), (10, 2155864), (16, 1347415), (20, 1077932), (31, 695440), (40, 538966), (62, 347720), (80, 269483), (124, 173860), (155, 139088), (248, 86930), (310, 69544), (496, 43465), (620, 34772), (1240, 17386), (2480, 8693)]