18880209

素因数分解:

$3^4\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{103}}^1$

素因数の和:219

約数の個数: 40

約数和(自身を含む): 29798912

約数和(自身を除く): 10918703

約数列:

[1, 3, 9, 27, 31, 73, 81, 93, 103, 219, 279, 309, 657, 837, 927, 1971, 2263, 2511, 2781, 3193, 5913, 6789, 7519, 8343, 9579, 20367, 22557, 28737, 61101, 67671, 86211, 183303, 203013, 233089, 258633, 609039, 699267, 2097801, 6293403, 18880209]

約数ペア:

[(1, 18880209), (3, 6293403), (9, 2097801), (27, 699267), (31, 609039), (73, 258633), (81, 233089), (93, 203013), (103, 183303), (219, 86211), (279, 67671), (309, 61101), (657, 28737), (837, 22557), (927, 20367), (1971, 9579), (2263, 8343), (2511, 7519), (2781, 6789), (3193, 5913)]