21789640

素因数分解:

$2^3\times 5^1\times {\mathrm{139}}^1\times {\mathrm{3919}}^1$

素因数の和:4069

約数の個数: 32

約数和(自身を含む): 49392000

約数和(自身を除く): 27602360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 139, 278, 556, 695, 1112, 1390, 2780, 3919, 5560, 7838, 15676, 19595, 31352, 39190, 78380, 156760, 544741, 1089482, 2178964, 2723705, 4357928, 5447410, 10894820, 21789640]

約数ペア:

[(1, 21789640), (2, 10894820), (4, 5447410), (5, 4357928), (8, 2723705), (10, 2178964), (20, 1089482), (40, 544741), (139, 156760), (278, 78380), (556, 39190), (695, 31352), (1112, 19595), (1390, 15676), (2780, 7838), (3919, 5560)]