21042440

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{6659}}^1$

素因数の和:6749

約数の個数: 32

約数和(自身を含む): 47952000

約数和(自身を除く): 26909560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 6659, 13318, 26636, 33295, 53272, 66590, 133180, 266360, 526061, 1052122, 2104244, 2630305, 4208488, 5260610, 10521220, 21042440]

約数ペア:

[(1, 21042440), (2, 10521220), (4, 5260610), (5, 4208488), (8, 2630305), (10, 2104244), (20, 1052122), (40, 526061), (79, 266360), (158, 133180), (316, 66590), (395, 53272), (632, 33295), (790, 26636), (1580, 13318), (3160, 6659)]