21481720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{379}}^1$

素因数の和:512

約数の個数: 64

約数和(自身を含む): 52668000

約数和(自身を除く): 31186280

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 109, 130, 218, 260, 379, 436, 520, 545, 758, 872, 1090, 1417, 1516, 1895, 2180, 2834, 3032, 3790, 4360, 4927, 5668, 7085, 7580, 9854, 11336, 14170, 15160, 19708, 24635, 28340, 39416, 41311, 49270, 56680, 82622, 98540, 165244, 197080, 206555, 330488, 413110, 537043, 826220, 1074086, 1652440, 2148172, 2685215, 4296344, 5370430, 10740860, 21481720]

約数ペア:

[(1, 21481720), (2, 10740860), (4, 5370430), (5, 4296344), (8, 2685215), (10, 2148172), (13, 1652440), (20, 1074086), (26, 826220), (40, 537043), (52, 413110), (65, 330488), (104, 206555), (109, 197080), (130, 165244), (218, 98540), (260, 82622), (379, 56680), (436, 49270), (520, 41311), (545, 39416), (758, 28340), (872, 24635), (1090, 19708), (1417, 15160), (1516, 14170), (1895, 11336), (2180, 9854), (2834, 7580), (3032, 7085), (3790, 5668), (4360, 4927)]