18189820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{929}}^1$

素因数の和:1038

約数の個数: 48

約数和(自身を含む): 42184800

約数和(自身を除く): 23994980

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 929, 979, 1780, 1858, 1958, 3716, 3916, 4645, 4895, 9290, 9790, 10219, 18580, 19580, 20438, 40876, 51095, 82681, 102190, 165362, 204380, 330724, 413405, 826810, 909491, 1653620, 1818982, 3637964, 4547455, 9094910, 18189820]

約数ペア:

[(1, 18189820), (2, 9094910), (4, 4547455), (5, 3637964), (10, 1818982), (11, 1653620), (20, 909491), (22, 826810), (44, 413405), (55, 330724), (89, 204380), (110, 165362), (178, 102190), (220, 82681), (356, 51095), (445, 40876), (890, 20438), (929, 19580), (979, 18580), (1780, 10219), (1858, 9790), (1958, 9290), (3716, 4895), (3916, 4645)]