20991640

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{22817}}^1$

素因数の和:22851

約数の個数: 32

約数和(自身を含む): 49286880

約数和(自身を除く): 28295240

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920, 22817, 45634, 91268, 114085, 182536, 228170, 456340, 524791, 912680, 1049582, 2099164, 2623955, 4198328, 5247910, 10495820, 20991640]

約数ペア:

[(1, 20991640), (2, 10495820), (4, 5247910), (5, 4198328), (8, 2623955), (10, 2099164), (20, 1049582), (23, 912680), (40, 524791), (46, 456340), (92, 228170), (115, 182536), (184, 114085), (230, 91268), (460, 45634), (920, 22817)]