21128996

素因数分解:

$2^2\times 7^2\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1$

素因数の和:193

約数の個数: 72

約数和(自身を含む): 46347840

約数和(自身を除く): 25218844

約数列:

[1, 2, 4, 7, 14, 23, 28, 43, 46, 49, 86, 92, 98, 109, 161, 172, 196, 218, 301, 322, 436, 602, 644, 763, 989, 1127, 1204, 1526, 1978, 2107, 2254, 2507, 3052, 3956, 4214, 4508, 4687, 5014, 5341, 6923, 8428, 9374, 10028, 10682, 13846, 17549, 18748, 21364, 27692, 32809, 35098, 48461, 65618, 70196, 96922, 107801, 122843, 131236, 193844, 215602, 229663, 245686, 431204, 459326, 491372, 754607, 918652, 1509214, 3018428, 5282249, 10564498, 21128996]

約数ペア:

[(1, 21128996), (2, 10564498), (4, 5282249), (7, 3018428), (14, 1509214), (23, 918652), (28, 754607), (43, 491372), (46, 459326), (49, 431204), (86, 245686), (92, 229663), (98, 215602), (109, 193844), (161, 131236), (172, 122843), (196, 107801), (218, 96922), (301, 70196), (322, 65618), (436, 48461), (602, 35098), (644, 32809), (763, 27692), (989, 21364), (1127, 18748), (1204, 17549), (1526, 13846), (1978, 10682), (2107, 10028), (2254, 9374), (2507, 8428), (3052, 6923), (3956, 5341), (4214, 5014), (4508, 4687)]