21807640

素因数分解:

$2^3\times 5^1\times {\mathrm{149}}^1\times {\mathrm{3659}}^1$

素因数の和:3819

約数の個数: 32

約数和(自身を含む): 49410000

約数和(自身を除く): 27602360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 149, 298, 596, 745, 1192, 1490, 2980, 3659, 5960, 7318, 14636, 18295, 29272, 36590, 73180, 146360, 545191, 1090382, 2180764, 2725955, 4361528, 5451910, 10903820, 21807640]

約数ペア:

[(1, 21807640), (2, 10903820), (4, 5451910), (5, 4361528), (8, 2725955), (10, 2180764), (20, 1090382), (40, 545191), (149, 146360), (298, 73180), (596, 36590), (745, 29272), (1192, 18295), (1490, 14636), (2980, 7318), (3659, 5960)]