21771440

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3833}}^1$

素因数の和:3917

約数の個数: 40

約数和(自身を含む): 51344928

約数和(自身を除く): 29573488

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3833, 5680, 7666, 15332, 19165, 30664, 38330, 61328, 76660, 153320, 272143, 306640, 544286, 1088572, 1360715, 2177144, 2721430, 4354288, 5442860, 10885720, 21771440]

約数ペア:

[(1, 21771440), (2, 10885720), (4, 5442860), (5, 4354288), (8, 2721430), (10, 2177144), (16, 1360715), (20, 1088572), (40, 544286), (71, 306640), (80, 272143), (142, 153320), (284, 76660), (355, 61328), (568, 38330), (710, 30664), (1136, 19165), (1420, 15332), (2840, 7666), (3833, 5680)]