21652760

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1039}}^1$

素因数の和:1571

約数の個数: 32

約数和(自身を含む): 48859200

約数和(自身を除く): 27206440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1039, 1042, 2078, 2084, 2605, 4156, 4168, 5195, 5210, 8312, 10390, 10420, 20780, 20840, 41560, 541319, 1082638, 2165276, 2706595, 4330552, 5413190, 10826380, 21652760]

約数ペア:

[(1, 21652760), (2, 10826380), (4, 5413190), (5, 4330552), (8, 2706595), (10, 2165276), (20, 1082638), (40, 541319), (521, 41560), (1039, 20840), (1042, 20780), (2078, 10420), (2084, 10390), (2605, 8312), (4156, 5210), (4168, 5195)]