21265940

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{191}}^1\times {\mathrm{293}}^1$

素因数の和:512

約数の個数: 48

約数和(自身を含む): 47416320

約数和(自身を除く): 26150380

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 191, 293, 380, 382, 586, 764, 955, 1172, 1465, 1910, 2930, 3629, 3820, 5567, 5860, 7258, 11134, 14516, 18145, 22268, 27835, 36290, 55670, 55963, 72580, 111340, 111926, 223852, 279815, 559630, 1063297, 1119260, 2126594, 4253188, 5316485, 10632970, 21265940]

約数ペア:

[(1, 21265940), (2, 10632970), (4, 5316485), (5, 4253188), (10, 2126594), (19, 1119260), (20, 1063297), (38, 559630), (76, 279815), (95, 223852), (190, 111926), (191, 111340), (293, 72580), (380, 55963), (382, 55670), (586, 36290), (764, 27835), (955, 22268), (1172, 18145), (1465, 14516), (1910, 11134), (2930, 7258), (3629, 5860), (3820, 5567)]