19801820

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{16231}}^1$

素因数の和:16301

約数の個数: 24

約数和(自身を含む): 42268128

約数和(自身を除く): 22466308

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 16231, 32462, 64924, 81155, 162310, 324620, 990091, 1980182, 3960364, 4950455, 9900910, 19801820]

約数ペア:

[(1, 19801820), (2, 9900910), (4, 4950455), (5, 3960364), (10, 1980182), (20, 990091), (61, 324620), (122, 162310), (244, 81155), (305, 64924), (610, 32462), (1220, 16231)]