21212020

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10501}}^1$

素因数の和:10611

約数の個数: 24

約数和(自身を含む): 44990568

約数和(自身を除く): 23778548

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10501, 21002, 42004, 52505, 105010, 210020, 1060601, 2121202, 4242404, 5303005, 10606010, 21212020]

約数ペア:

[(1, 21212020), (2, 10606010), (4, 5303005), (5, 4242404), (10, 2121202), (20, 1060601), (101, 210020), (202, 105010), (404, 52505), (505, 42004), (1010, 21002), (2020, 10501)]