21531237

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{593}}^1$

素因数の和:642

約数の個数: 48

約数和(自身を含む): 37920960

約数和(自身を除く): 16389723

約数列:

[1, 3, 7, 13, 19, 21, 39, 49, 57, 91, 133, 147, 247, 273, 399, 593, 637, 741, 931, 1729, 1779, 1911, 2793, 4151, 5187, 7709, 11267, 12103, 12453, 23127, 29057, 33801, 36309, 53963, 78869, 87171, 146471, 161889, 236607, 377741, 439413, 552083, 1025297, 1133223, 1656249, 3075891, 7177079, 21531237]

約数ペア:

[(1, 21531237), (3, 7177079), (7, 3075891), (13, 1656249), (19, 1133223), (21, 1025297), (39, 552083), (49, 439413), (57, 377741), (91, 236607), (133, 161889), (147, 146471), (247, 87171), (273, 78869), (399, 53963), (593, 36309), (637, 33801), (741, 29057), (931, 23127), (1729, 12453), (1779, 12103), (1911, 11267), (2793, 7709), (4151, 5187)]