21780860

素因数分解:

$2^2\times 5^1\times {\mathrm{83}}^1\times {\mathrm{13121}}^1$

素因数の和:13213

約数の個数: 24

約数和(自身を含む): 46294416

約数和(自身を除く): 24513556

約数列:

[1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660, 13121, 26242, 52484, 65605, 131210, 262420, 1089043, 2178086, 4356172, 5445215, 10890430, 21780860]

約数ペア:

[(1, 21780860), (2, 10890430), (4, 5445215), (5, 4356172), (10, 2178086), (20, 1089043), (83, 262420), (166, 131210), (332, 65605), (415, 52484), (830, 26242), (1660, 13121)]