21237860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{5231}}^1$

素因数の和:5276

約数の個数: 48

約数和(自身を含む): 52738560

約数和(自身を除く): 31500700

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 116, 140, 145, 203, 290, 406, 580, 812, 1015, 2030, 4060, 5231, 10462, 20924, 26155, 36617, 52310, 73234, 104620, 146468, 151699, 183085, 303398, 366170, 606796, 732340, 758495, 1061893, 1516990, 2123786, 3033980, 4247572, 5309465, 10618930, 21237860]

約数ペア:

[(1, 21237860), (2, 10618930), (4, 5309465), (5, 4247572), (7, 3033980), (10, 2123786), (14, 1516990), (20, 1061893), (28, 758495), (29, 732340), (35, 606796), (58, 366170), (70, 303398), (116, 183085), (140, 151699), (145, 146468), (203, 104620), (290, 73234), (406, 52310), (580, 36617), (812, 26155), (1015, 20924), (2030, 10462), (4060, 5231)]