21688840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17491}}^1$

素因数の和:17533

約数の個数: 32

約数和(自身を含む): 50376960

約数和(自身を除く): 28688120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17491, 34982, 69964, 87455, 139928, 174910, 349820, 542221, 699640, 1084442, 2168884, 2711105, 4337768, 5422210, 10844420, 21688840]

約数ペア:

[(1, 21688840), (2, 10844420), (4, 5422210), (5, 4337768), (8, 2711105), (10, 2168884), (20, 1084442), (31, 699640), (40, 542221), (62, 349820), (124, 174910), (155, 139928), (248, 87455), (310, 69964), (620, 34982), (1240, 17491)]