21262020

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{27259}}^1$

素因数の和:27284

約数の個数: 48

約数和(自身を含む): 64115520

約数和(自身を除く): 42853500

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 27259, 54518, 81777, 109036, 136295, 163554, 272590, 327108, 354367, 408885, 545180, 708734, 817770, 1063101, 1417468, 1635540, 1771835, 2126202, 3543670, 4252404, 5315505, 7087340, 10631010, 21262020]

約数ペア:

[(1, 21262020), (2, 10631010), (3, 7087340), (4, 5315505), (5, 4252404), (6, 3543670), (10, 2126202), (12, 1771835), (13, 1635540), (15, 1417468), (20, 1063101), (26, 817770), (30, 708734), (39, 545180), (52, 408885), (60, 354367), (65, 327108), (78, 272590), (130, 163554), (156, 136295), (195, 109036), (260, 81777), (390, 54518), (780, 27259)]