21396680

素因数分解:

$2^3\times 5^1\times {\mathrm{313}}^1\times {\mathrm{1709}}^1$

素因数の和:2033

約数の個数: 32

約数和(自身を含む): 48324600

約数和(自身を除く): 26927920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 313, 626, 1252, 1565, 1709, 2504, 3130, 3418, 6260, 6836, 8545, 12520, 13672, 17090, 34180, 68360, 534917, 1069834, 2139668, 2674585, 4279336, 5349170, 10698340, 21396680]

約数ペア:

[(1, 21396680), (2, 10698340), (4, 5349170), (5, 4279336), (8, 2674585), (10, 2139668), (20, 1069834), (40, 534917), (313, 68360), (626, 34180), (1252, 17090), (1565, 13672), (1709, 12520), (2504, 8545), (3130, 6836), (3418, 6260)]