81238660

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{16183}}^1$

素因数の和:16443

約数の個数: 24

約数和(自身を含む): 171291456

約数和(自身を除く): 90052796

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 5020, 16183, 32366, 64732, 80915, 161830, 323660, 4061933, 8123866, 16247732, 20309665, 40619330, 81238660]

約数ペア:

[(1, 81238660), (2, 40619330), (4, 20309665), (5, 16247732), (10, 8123866), (20, 4061933), (251, 323660), (502, 161830), (1004, 80915), (1255, 64732), (2510, 32366), (5020, 16183)]