20955940

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{193}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 45465840

約数和(自身を除く): 24509900

約数列:

[1, 2, 4, 5, 10, 20, 61, 89, 122, 178, 193, 244, 305, 356, 386, 445, 610, 772, 890, 965, 1220, 1780, 1930, 3860, 5429, 10858, 11773, 17177, 21716, 23546, 27145, 34354, 47092, 54290, 58865, 68708, 85885, 108580, 117730, 171770, 235460, 343540, 1047797, 2095594, 4191188, 5238985, 10477970, 20955940]

約数ペア:

[(1, 20955940), (2, 10477970), (4, 5238985), (5, 4191188), (10, 2095594), (20, 1047797), (61, 343540), (89, 235460), (122, 171770), (178, 117730), (193, 108580), (244, 85885), (305, 68708), (356, 58865), (386, 54290), (445, 47092), (610, 34354), (772, 27145), (890, 23546), (965, 21716), (1220, 17177), (1780, 11773), (1930, 10858), (3860, 5429)]