21228880

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3359}}^1$

素因数の和:3451

約数の個数: 40

約数和(自身を含む): 49996800

約数和(自身を除く): 28767920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3359, 6320, 6718, 13436, 16795, 26872, 33590, 53744, 67180, 134360, 265361, 268720, 530722, 1061444, 1326805, 2122888, 2653610, 4245776, 5307220, 10614440, 21228880]

約数ペア:

[(1, 21228880), (2, 10614440), (4, 5307220), (5, 4245776), (8, 2653610), (10, 2122888), (16, 1326805), (20, 1061444), (40, 530722), (79, 268720), (80, 265361), (158, 134360), (316, 67180), (395, 53744), (632, 33590), (790, 26872), (1264, 16795), (1580, 13436), (3160, 6718), (3359, 6320)]