21781540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{181}}^1\times {\mathrm{547}}^1$

素因数の和:748

約数の個数: 48

約数和(自身を含む): 50266944

約数和(自身を除く): 28485404

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 181, 220, 362, 547, 724, 905, 1094, 1810, 1991, 2188, 2735, 3620, 3982, 5470, 6017, 7964, 9955, 10940, 12034, 19910, 24068, 30085, 39820, 60170, 99007, 120340, 198014, 396028, 495035, 990070, 1089077, 1980140, 2178154, 4356308, 5445385, 10890770, 21781540]

約数ペア:

[(1, 21781540), (2, 10890770), (4, 5445385), (5, 4356308), (10, 2178154), (11, 1980140), (20, 1089077), (22, 990070), (44, 495035), (55, 396028), (110, 198014), (181, 120340), (220, 99007), (362, 60170), (547, 39820), (724, 30085), (905, 24068), (1094, 19910), (1810, 12034), (1991, 10940), (2188, 9955), (2735, 7964), (3620, 6017), (3982, 5470)]