21556780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4967}}^1$

素因数の和:5014

約数の個数: 48

約数和(自身を含む): 53415936

約数和(自身を除く): 31859156

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4967, 9934, 19868, 24835, 34769, 49670, 69538, 99340, 139076, 153977, 173845, 307954, 347690, 615908, 695380, 769885, 1077839, 1539770, 2155678, 3079540, 4311356, 5389195, 10778390, 21556780]

約数ペア:

[(1, 21556780), (2, 10778390), (4, 5389195), (5, 4311356), (7, 3079540), (10, 2155678), (14, 1539770), (20, 1077839), (28, 769885), (31, 695380), (35, 615908), (62, 347690), (70, 307954), (124, 173845), (140, 153977), (155, 139076), (217, 99340), (310, 69538), (434, 49670), (620, 34769), (868, 24835), (1085, 19868), (2170, 9934), (4340, 4967)]