21254680

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{251}}^1$

素因数の和:364

約数の個数: 64

約数和(自身を含む): 50349600

約数和(自身を除く): 29094920

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 73, 116, 145, 146, 232, 251, 290, 292, 365, 502, 580, 584, 730, 1004, 1160, 1255, 1460, 2008, 2117, 2510, 2920, 4234, 5020, 7279, 8468, 10040, 10585, 14558, 16936, 18323, 21170, 29116, 36395, 36646, 42340, 58232, 72790, 73292, 84680, 91615, 145580, 146584, 183230, 291160, 366460, 531367, 732920, 1062734, 2125468, 2656835, 4250936, 5313670, 10627340, 21254680]

約数ペア:

[(1, 21254680), (2, 10627340), (4, 5313670), (5, 4250936), (8, 2656835), (10, 2125468), (20, 1062734), (29, 732920), (40, 531367), (58, 366460), (73, 291160), (116, 183230), (145, 146584), (146, 145580), (232, 91615), (251, 84680), (290, 73292), (292, 72790), (365, 58232), (502, 42340), (580, 36646), (584, 36395), (730, 29116), (1004, 21170), (1160, 18323), (1255, 16936), (1460, 14558), (2008, 10585), (2117, 10040), (2510, 8468), (2920, 7279), (4234, 5020)]