21578139

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 35942400

約数和(自身を除く): 14364261

約数列:

[1, 3, 9, 11, 31, 33, 79, 89, 93, 99, 237, 267, 279, 341, 711, 801, 869, 979, 1023, 2449, 2607, 2759, 2937, 3069, 7031, 7347, 7821, 8277, 8811, 21093, 22041, 24831, 26939, 30349, 63279, 77341, 80817, 91047, 217961, 232023, 242451, 273141, 653883, 696069, 1961649, 2397571, 7192713, 21578139]

約数ペア:

[(1, 21578139), (3, 7192713), (9, 2397571), (11, 1961649), (31, 696069), (33, 653883), (79, 273141), (89, 242451), (93, 232023), (99, 217961), (237, 91047), (267, 80817), (279, 77341), (341, 63279), (711, 30349), (801, 26939), (869, 24831), (979, 22041), (1023, 21093), (2449, 8811), (2607, 8277), (2759, 7821), (2937, 7347), (3069, 7031)]