28505720

素因数分解:

$2^3\times 5^1\times {\mathrm{331}}^1\times {\mathrm{2153}}^1$

素因数の和:2495

約数の個数: 32

約数和(自身を含む): 64361520

約数和(自身を除く): 35855800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 331, 662, 1324, 1655, 2153, 2648, 3310, 4306, 6620, 8612, 10765, 13240, 17224, 21530, 43060, 86120, 712643, 1425286, 2850572, 3563215, 5701144, 7126430, 14252860, 28505720]

約数ペア:

[(1, 28505720), (2, 14252860), (4, 7126430), (5, 5701144), (8, 3563215), (10, 2850572), (20, 1425286), (40, 712643), (331, 86120), (662, 43060), (1324, 21530), (1655, 17224), (2153, 13240), (2648, 10765), (3310, 8612), (4306, 6620)]