20218815

素因数分解:

$3^7\times 5^1\times {\mathrm{43}}^2$

素因数の和:112

約数の個数: 48

約数和(自身を含む): 37254240

約数和(自身を除く): 17035425

約数列:

[1, 3, 5, 9, 15, 27, 43, 45, 81, 129, 135, 215, 243, 387, 405, 645, 729, 1161, 1215, 1849, 1935, 2187, 3483, 3645, 5547, 5805, 9245, 10449, 10935, 16641, 17415, 27735, 31347, 49923, 52245, 83205, 94041, 149769, 156735, 249615, 449307, 470205, 748845, 1347921, 2246535, 4043763, 6739605, 20218815]

約数ペア:

[(1, 20218815), (3, 6739605), (5, 4043763), (9, 2246535), (15, 1347921), (27, 748845), (43, 470205), (45, 449307), (81, 249615), (129, 156735), (135, 149769), (215, 94041), (243, 83205), (387, 52245), (405, 49923), (645, 31347), (729, 27735), (1161, 17415), (1215, 16641), (1849, 10935), (1935, 10449), (2187, 9245), (3483, 5805), (3645, 5547)]