21400940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{1093}}^1$

素因数の和:1202

約数の個数: 48

約数和(自身を含む): 49623840

約数和(自身を除く): 28222900

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1093, 1780, 1958, 2186, 3916, 4372, 4895, 5465, 9790, 10930, 12023, 19580, 21860, 24046, 48092, 60115, 97277, 120230, 194554, 240460, 389108, 486385, 972770, 1070047, 1945540, 2140094, 4280188, 5350235, 10700470, 21400940]

約数ペア:

[(1, 21400940), (2, 10700470), (4, 5350235), (5, 4280188), (10, 2140094), (11, 1945540), (20, 1070047), (22, 972770), (44, 486385), (55, 389108), (89, 240460), (110, 194554), (178, 120230), (220, 97277), (356, 60115), (445, 48092), (890, 24046), (979, 21860), (1093, 19580), (1780, 12023), (1958, 10930), (2186, 9790), (3916, 5465), (4372, 4895)]