21680668

素因数分解:

$2^2\times {\mathrm{37}}^1\times {\mathrm{263}}^1\times {\mathrm{557}}^1$

素因数の和:861

約数の個数: 24

約数和(自身を含む): 39184992

約数和(自身を除く): 17504324

約数列:

[1, 2, 4, 37, 74, 148, 263, 526, 557, 1052, 1114, 2228, 9731, 19462, 20609, 38924, 41218, 82436, 146491, 292982, 585964, 5420167, 10840334, 21680668]

約数ペア:

[(1, 21680668), (2, 10840334), (4, 5420167), (37, 585964), (74, 292982), (148, 146491), (263, 82436), (526, 41218), (557, 38924), (1052, 20609), (1114, 19462), (2228, 9731)]