20990751

素因数分解:

$3^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{181}}^1$

素因数の和:287

約数の個数: 32

約数和(自身を含む): 30750720

約数和(自身を除く): 9759969

約数列:

[1, 3, 29, 31, 43, 87, 93, 129, 181, 543, 899, 1247, 1333, 2697, 3741, 3999, 5249, 5611, 7783, 15747, 16833, 23349, 38657, 115971, 162719, 225707, 241273, 488157, 677121, 723819, 6996917, 20990751]

約数ペア:

[(1, 20990751), (3, 6996917), (29, 723819), (31, 677121), (43, 488157), (87, 241273), (93, 225707), (129, 162719), (181, 115971), (543, 38657), (899, 23349), (1247, 16833), (1333, 15747), (2697, 7783), (3741, 5611), (3999, 5249)]