21555640

素因数分解:

$2^3\times 5^1\times {\mathrm{347}}^1\times {\mathrm{1553}}^1$

素因数の和:1911

約数の個数: 32

約数和(自身を含む): 48671280

約数和(自身を除く): 27115640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 347, 694, 1388, 1553, 1735, 2776, 3106, 3470, 6212, 6940, 7765, 12424, 13880, 15530, 31060, 62120, 538891, 1077782, 2155564, 2694455, 4311128, 5388910, 10777820, 21555640]

約数ペア:

[(1, 21555640), (2, 10777820), (4, 5388910), (5, 4311128), (8, 2694455), (10, 2155564), (20, 1077782), (40, 538891), (347, 62120), (694, 31060), (1388, 15530), (1553, 13880), (1735, 12424), (2776, 7765), (3106, 6940), (3470, 6212)]