21912020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{1187}}^1$

素因数の和:1280

約数の個数: 48

約数和(自身を含む): 50295168

約数和(自身を除く): 28383148

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 71, 130, 142, 260, 284, 355, 710, 923, 1187, 1420, 1846, 2374, 3692, 4615, 4748, 5935, 9230, 11870, 15431, 18460, 23740, 30862, 61724, 77155, 84277, 154310, 168554, 308620, 337108, 421385, 842770, 1095601, 1685540, 2191202, 4382404, 5478005, 10956010, 21912020]

約数ペア:

[(1, 21912020), (2, 10956010), (4, 5478005), (5, 4382404), (10, 2191202), (13, 1685540), (20, 1095601), (26, 842770), (52, 421385), (65, 337108), (71, 308620), (130, 168554), (142, 154310), (260, 84277), (284, 77155), (355, 61724), (710, 30862), (923, 23740), (1187, 18460), (1420, 15431), (1846, 11870), (2374, 9230), (3692, 5935), (4615, 4748)]