21158980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{191}}^2$

素因数の和:420

約数の個数: 36

約数和(自身を含む): 46207980

約数和(自身を除く): 25049000

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 191, 290, 382, 580, 764, 955, 1910, 3820, 5539, 11078, 22156, 27695, 36481, 55390, 72962, 110780, 145924, 182405, 364810, 729620, 1057949, 2115898, 4231796, 5289745, 10579490, 21158980]

約数ペア:

[(1, 21158980), (2, 10579490), (4, 5289745), (5, 4231796), (10, 2115898), (20, 1057949), (29, 729620), (58, 364810), (116, 182405), (145, 145924), (191, 110780), (290, 72962), (382, 55390), (580, 36481), (764, 27695), (955, 22156), (1910, 11078), (3820, 5539)]