21636740

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{181}}^1$

素因数の和:372

約数の個数: 48

約数和(自身を含む): 47087040

約数和(自身を除く): 25450300

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 139, 172, 181, 215, 278, 362, 430, 556, 695, 724, 860, 905, 1390, 1810, 2780, 3620, 5977, 7783, 11954, 15566, 23908, 25159, 29885, 31132, 38915, 50318, 59770, 77830, 100636, 119540, 125795, 155660, 251590, 503180, 1081837, 2163674, 4327348, 5409185, 10818370, 21636740]

約数ペア:

[(1, 21636740), (2, 10818370), (4, 5409185), (5, 4327348), (10, 2163674), (20, 1081837), (43, 503180), (86, 251590), (139, 155660), (172, 125795), (181, 119540), (215, 100636), (278, 77830), (362, 59770), (430, 50318), (556, 38915), (695, 31132), (724, 29885), (860, 25159), (905, 23908), (1390, 15566), (1810, 11954), (2780, 7783), (3620, 5977)]