21516920

素因数分解:

$2^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{6481}}^1$

素因数の和:6575

約数の個数: 32

約数和(自身を含む): 49003920

約数和(自身を除く): 27487000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 83, 166, 332, 415, 664, 830, 1660, 3320, 6481, 12962, 25924, 32405, 51848, 64810, 129620, 259240, 537923, 1075846, 2151692, 2689615, 4303384, 5379230, 10758460, 21516920]

約数ペア:

[(1, 21516920), (2, 10758460), (4, 5379230), (5, 4303384), (8, 2689615), (10, 2151692), (20, 1075846), (40, 537923), (83, 259240), (166, 129620), (332, 64810), (415, 51848), (664, 32405), (830, 25924), (1660, 12962), (3320, 6481)]