21151880

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{11251}}^1$

素因数の和:11309

約数の個数: 32

約数和(自身を含む): 48608640

約数和(自身を除く): 27456760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 94, 188, 235, 376, 470, 940, 1880, 11251, 22502, 45004, 56255, 90008, 112510, 225020, 450040, 528797, 1057594, 2115188, 2643985, 4230376, 5287970, 10575940, 21151880]

約数ペア:

[(1, 21151880), (2, 10575940), (4, 5287970), (5, 4230376), (8, 2643985), (10, 2115188), (20, 1057594), (40, 528797), (47, 450040), (94, 225020), (188, 112510), (235, 90008), (376, 56255), (470, 45004), (940, 22502), (1880, 11251)]