20878965

素因数分解:

$3^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1663}}^1$

素因数の和:1711

約数の個数: 40

約数和(自身を含む): 38658048

約数和(自身を除く): 17779083

約数列:

[1, 3, 5, 9, 15, 27, 31, 45, 81, 93, 135, 155, 279, 405, 465, 837, 1395, 1663, 2511, 4185, 4989, 8315, 12555, 14967, 24945, 44901, 51553, 74835, 134703, 154659, 224505, 257765, 463977, 673515, 773295, 1391931, 2319885, 4175793, 6959655, 20878965]

約数ペア:

[(1, 20878965), (3, 6959655), (5, 4175793), (9, 2319885), (15, 1391931), (27, 773295), (31, 673515), (45, 463977), (81, 257765), (93, 224505), (135, 154659), (155, 134703), (279, 74835), (405, 51553), (465, 44901), (837, 24945), (1395, 14967), (1663, 12555), (2511, 8315), (4185, 4989)]