21148695

素因数分解:

$3^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{661}}^1$

素因数の和:757

約数の個数: 40

約数和(自身を含む): 38448960

約数和(自身を除く): 17300265

約数列:

[1, 3, 5, 9, 15, 27, 45, 79, 81, 135, 237, 395, 405, 661, 711, 1185, 1983, 2133, 3305, 3555, 5949, 6399, 9915, 10665, 17847, 29745, 31995, 52219, 53541, 89235, 156657, 261095, 267705, 469971, 783285, 1409913, 2349855, 4229739, 7049565, 21148695]

約数ペア:

[(1, 21148695), (3, 7049565), (5, 4229739), (9, 2349855), (15, 1409913), (27, 783285), (45, 469971), (79, 267705), (81, 261095), (135, 156657), (237, 89235), (395, 53541), (405, 52219), (661, 31995), (711, 29745), (1185, 17847), (1983, 10665), (2133, 9915), (3305, 6399), (3555, 5949)]