21195980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{6271}}^1$

素因数の和:6306

約数の個数: 36

約数和(自身を含む): 48206592

約数和(自身を除く): 27010612

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 6271, 12542, 25084, 31355, 62710, 81523, 125420, 163046, 326092, 407615, 815230, 1059799, 1630460, 2119598, 4239196, 5298995, 10597990, 21195980]

約数ペア:

[(1, 21195980), (2, 10597990), (4, 5298995), (5, 4239196), (10, 2119598), (13, 1630460), (20, 1059799), (26, 815230), (52, 407615), (65, 326092), (130, 163046), (169, 125420), (260, 81523), (338, 62710), (676, 31355), (845, 25084), (1690, 12542), (3380, 6271)]