20667640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{331}}^1$

素因数の和:572

約数の個数: 64

約数和(自身を含む): 53544960

約数和(自身を除く): 32877320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 223, 280, 331, 446, 662, 892, 1115, 1324, 1561, 1655, 1784, 2230, 2317, 2648, 3122, 3310, 4460, 4634, 6244, 6620, 7805, 8920, 9268, 11585, 12488, 13240, 15610, 18536, 23170, 31220, 46340, 62440, 73813, 92680, 147626, 295252, 369065, 516691, 590504, 738130, 1033382, 1476260, 2066764, 2583455, 2952520, 4133528, 5166910, 10333820, 20667640]

約数ペア:

[(1, 20667640), (2, 10333820), (4, 5166910), (5, 4133528), (7, 2952520), (8, 2583455), (10, 2066764), (14, 1476260), (20, 1033382), (28, 738130), (35, 590504), (40, 516691), (56, 369065), (70, 295252), (140, 147626), (223, 92680), (280, 73813), (331, 62440), (446, 46340), (662, 31220), (892, 23170), (1115, 18536), (1324, 15610), (1561, 13240), (1655, 12488), (1784, 11585), (2230, 9268), (2317, 8920), (2648, 7805), (3122, 6620), (3310, 6244), (4460, 4634)]