21328880

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15683}}^1$

素因数の和:15713

約数の個数: 40

約数和(自身を含む): 52510032

約数和(自身を除く): 31181152

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15683, 31366, 62732, 78415, 125464, 156830, 250928, 266611, 313660, 533222, 627320, 1066444, 1254640, 1333055, 2132888, 2666110, 4265776, 5332220, 10664440, 21328880]

約数ペア:

[(1, 21328880), (2, 10664440), (4, 5332220), (5, 4265776), (8, 2666110), (10, 2132888), (16, 1333055), (17, 1254640), (20, 1066444), (34, 627320), (40, 533222), (68, 313660), (80, 266611), (85, 250928), (136, 156830), (170, 125464), (272, 78415), (340, 62732), (680, 31366), (1360, 15683)]