21815860

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{1871}}^1$

素因数の和:1944

約数の個数: 48

約数和(自身を含む): 50948352

約数和(自身を除く): 29132492

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 53, 55, 106, 110, 212, 220, 265, 530, 583, 1060, 1166, 1871, 2332, 2915, 3742, 5830, 7484, 9355, 11660, 18710, 20581, 37420, 41162, 82324, 99163, 102905, 198326, 205810, 396652, 411620, 495815, 991630, 1090793, 1983260, 2181586, 4363172, 5453965, 10907930, 21815860]

約数ペア:

[(1, 21815860), (2, 10907930), (4, 5453965), (5, 4363172), (10, 2181586), (11, 1983260), (20, 1090793), (22, 991630), (44, 495815), (53, 411620), (55, 396652), (106, 205810), (110, 198326), (212, 102905), (220, 99163), (265, 82324), (530, 41162), (583, 37420), (1060, 20581), (1166, 18710), (1871, 11660), (2332, 9355), (2915, 7484), (3742, 5830)]