21148180

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{109}}^2$

素因数の和:316

約数の個数: 36

約数和(自身を含む): 45325980

約数和(自身を除く): 24177800

約数列:

[1, 2, 4, 5, 10, 20, 89, 109, 178, 218, 356, 436, 445, 545, 890, 1090, 1780, 2180, 9701, 11881, 19402, 23762, 38804, 47524, 48505, 59405, 97010, 118810, 194020, 237620, 1057409, 2114818, 4229636, 5287045, 10574090, 21148180]

約数ペア:

[(1, 21148180), (2, 10574090), (4, 5287045), (5, 4229636), (10, 2114818), (20, 1057409), (89, 237620), (109, 194020), (178, 118810), (218, 97010), (356, 59405), (436, 48505), (445, 47524), (545, 38804), (890, 23762), (1090, 19402), (1780, 11881), (2180, 9701)]