18920421

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:210

約数の個数: 48

約数和(自身を含む): 31449600

約数和(自身を除く): 12529179

約数列:

[1, 3, 9, 13, 23, 39, 69, 79, 89, 117, 207, 237, 267, 299, 711, 801, 897, 1027, 1157, 1817, 2047, 2691, 3081, 3471, 5451, 6141, 7031, 9243, 10413, 16353, 18423, 21093, 23621, 26611, 63279, 70863, 79833, 91403, 161713, 212589, 239499, 274209, 485139, 822627, 1455417, 2102269, 6306807, 18920421]

約数ペア:

[(1, 18920421), (3, 6306807), (9, 2102269), (13, 1455417), (23, 822627), (39, 485139), (69, 274209), (79, 239499), (89, 212589), (117, 161713), (207, 91403), (237, 79833), (267, 70863), (299, 63279), (711, 26611), (801, 23621), (897, 21093), (1027, 18423), (1157, 16353), (1817, 10413), (2047, 9243), (2691, 7031), (3081, 6141), (3471, 5451)]