21000948020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1878439}}^1$

素因数の和:1878504

約数の個数: 48

約数和(自身を含む): 48598999680

約数和(自身を除く): 27598051660

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 2236, 2795, 5590, 11180, 1878439, 3756878, 7513756, 9392195, 18784390, 24419707, 37568780, 48839414, 80772877, 97678828, 122098535, 161545754, 244197070, 323091508, 403864385, 488394140, 807728770, 1050047401, 1615457540, 2100094802, 4200189604, 5250237005, 10500474010, 21000948020]

約数ペア:

[(1, 21000948020), (2, 10500474010), (4, 5250237005), (5, 4200189604), (10, 2100094802), (13, 1615457540), (20, 1050047401), (26, 807728770), (43, 488394140), (52, 403864385), (65, 323091508), (86, 244197070), (130, 161545754), (172, 122098535), (215, 97678828), (260, 80772877), (430, 48839414), (559, 37568780), (860, 24419707), (1118, 18784390), (2236, 9392195), (2795, 7513756), (5590, 3756878), (11180, 1878439)]