20523503

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{101}}^1$

素因数の和:168

約数の個数: 48

約数和(自身を含む): 29302560

約数和(自身を除く): 8779057

約数列:

[1, 7, 11, 13, 29, 49, 77, 91, 101, 143, 203, 319, 377, 539, 637, 707, 1001, 1111, 1313, 1421, 2233, 2639, 2929, 4147, 4949, 7007, 7777, 9191, 14443, 15631, 18473, 20503, 29029, 32219, 38077, 54439, 64337, 101101, 143521, 203203, 225533, 266539, 418847, 707707, 1578731, 1865773, 2931929, 20523503]

約数ペア:

[(1, 20523503), (7, 2931929), (11, 1865773), (13, 1578731), (29, 707707), (49, 418847), (77, 266539), (91, 225533), (101, 203203), (143, 143521), (203, 101101), (319, 64337), (377, 54439), (539, 38077), (637, 32219), (707, 29029), (1001, 20503), (1111, 18473), (1313, 15631), (1421, 14443), (2233, 9191), (2639, 7777), (2929, 7007), (4147, 4949)]