21402040

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{127}}^1\times {\mathrm{383}}^1$

素因数の和:532

約数の個数: 64

約数和(自身を含む): 53084160

約数和(自身を除く): 31682120

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 127, 220, 254, 383, 440, 508, 635, 766, 1016, 1270, 1397, 1532, 1915, 2540, 2794, 3064, 3830, 4213, 5080, 5588, 6985, 7660, 8426, 11176, 13970, 15320, 16852, 21065, 27940, 33704, 42130, 48641, 55880, 84260, 97282, 168520, 194564, 243205, 389128, 486410, 535051, 972820, 1070102, 1945640, 2140204, 2675255, 4280408, 5350510, 10701020, 21402040]

約数ペア:

[(1, 21402040), (2, 10701020), (4, 5350510), (5, 4280408), (8, 2675255), (10, 2140204), (11, 1945640), (20, 1070102), (22, 972820), (40, 535051), (44, 486410), (55, 389128), (88, 243205), (110, 194564), (127, 168520), (220, 97282), (254, 84260), (383, 55880), (440, 48641), (508, 42130), (635, 33704), (766, 27940), (1016, 21065), (1270, 16852), (1397, 15320), (1532, 13970), (1915, 11176), (2540, 8426), (2794, 7660), (3064, 6985), (3830, 5588), (4213, 5080)]