21565940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{1607}}^1$

素因数の和:1688

約数の個数: 48

約数和(自身を含む): 50246784

約数和(自身を除く): 28680844

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 61, 110, 122, 220, 244, 305, 610, 671, 1220, 1342, 1607, 2684, 3214, 3355, 6428, 6710, 8035, 13420, 16070, 17677, 32140, 35354, 70708, 88385, 98027, 176770, 196054, 353540, 392108, 490135, 980270, 1078297, 1960540, 2156594, 4313188, 5391485, 10782970, 21565940]

約数ペア:

[(1, 21565940), (2, 10782970), (4, 5391485), (5, 4313188), (10, 2156594), (11, 1960540), (20, 1078297), (22, 980270), (44, 490135), (55, 392108), (61, 353540), (110, 196054), (122, 176770), (220, 98027), (244, 88385), (305, 70708), (610, 35354), (671, 32140), (1220, 17677), (1342, 16070), (1607, 13420), (2684, 8035), (3214, 6710), (3355, 6428)]