21085880

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5923}}^1$

素因数の和:6023

約数の個数: 32

約数和(自身を含む): 47984400

約数和(自身を除く): 26898520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5923, 11846, 23692, 29615, 47384, 59230, 118460, 236920, 527147, 1054294, 2108588, 2635735, 4217176, 5271470, 10542940, 21085880]

約数ペア:

[(1, 21085880), (2, 10542940), (4, 5271470), (5, 4217176), (8, 2635735), (10, 2108588), (20, 1054294), (40, 527147), (89, 236920), (178, 118460), (356, 59230), (445, 47384), (712, 29615), (890, 23692), (1780, 11846), (3560, 5923)]