21990980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{5261}}^1$

素因数の和:5300

約数の個数: 48

約数和(自身を含む): 53040960

約数和(自身を除く): 31049980

約数列:

[1, 2, 4, 5, 10, 11, 19, 20, 22, 38, 44, 55, 76, 95, 110, 190, 209, 220, 380, 418, 836, 1045, 2090, 4180, 5261, 10522, 21044, 26305, 52610, 57871, 99959, 105220, 115742, 199918, 231484, 289355, 399836, 499795, 578710, 999590, 1099549, 1157420, 1999180, 2199098, 4398196, 5497745, 10995490, 21990980]

約数ペア:

[(1, 21990980), (2, 10995490), (4, 5497745), (5, 4398196), (10, 2199098), (11, 1999180), (19, 1157420), (20, 1099549), (22, 999590), (38, 578710), (44, 499795), (55, 399836), (76, 289355), (95, 231484), (110, 199918), (190, 115742), (209, 105220), (220, 99959), (380, 57871), (418, 52610), (836, 26305), (1045, 21044), (2090, 10522), (4180, 5261)]