21870320

素因数分解:

$2^4\times 5^1\times {\mathrm{167}}^1\times {\mathrm{1637}}^1$

素因数の和:1817

約数の個数: 40

約数和(自身を含む): 51184224

約数和(自身を除く): 29313904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 167, 334, 668, 835, 1336, 1637, 1670, 2672, 3274, 3340, 6548, 6680, 8185, 13096, 13360, 16370, 26192, 32740, 65480, 130960, 273379, 546758, 1093516, 1366895, 2187032, 2733790, 4374064, 5467580, 10935160, 21870320]

約数ペア:

[(1, 21870320), (2, 10935160), (4, 5467580), (5, 4374064), (8, 2733790), (10, 2187032), (16, 1366895), (20, 1093516), (40, 546758), (80, 273379), (167, 130960), (334, 65480), (668, 32740), (835, 26192), (1336, 16370), (1637, 13360), (1670, 13096), (2672, 8185), (3274, 6680), (3340, 6548)]