21131720

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{18217}}^1$

素因数の和:18257

約数の個数: 32

約数和(自身を含む): 49188600

約数和(自身を除く): 28056880

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 145, 232, 290, 580, 1160, 18217, 36434, 72868, 91085, 145736, 182170, 364340, 528293, 728680, 1056586, 2113172, 2641465, 4226344, 5282930, 10565860, 21131720]

約数ペア:

[(1, 21131720), (2, 10565860), (4, 5282930), (5, 4226344), (8, 2641465), (10, 2113172), (20, 1056586), (29, 728680), (40, 528293), (58, 364340), (116, 182170), (145, 145736), (232, 91085), (290, 72868), (580, 36434), (1160, 18217)]