19998020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{83}}^1\times {\mathrm{1721}}^1$

素因数の和:1820

約数の個数: 48

約数和(自身を含む): 48601728

約数和(自身を除く): 28603708

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 83, 140, 166, 332, 415, 581, 830, 1162, 1660, 1721, 2324, 2905, 3442, 5810, 6884, 8605, 11620, 12047, 17210, 24094, 34420, 48188, 60235, 120470, 142843, 240940, 285686, 571372, 714215, 999901, 1428430, 1999802, 2856860, 3999604, 4999505, 9999010, 19998020]

約数ペア:

[(1, 19998020), (2, 9999010), (4, 4999505), (5, 3999604), (7, 2856860), (10, 1999802), (14, 1428430), (20, 999901), (28, 714215), (35, 571372), (70, 285686), (83, 240940), (140, 142843), (166, 120470), (332, 60235), (415, 48188), (581, 34420), (830, 24094), (1162, 17210), (1660, 12047), (1721, 11620), (2324, 8605), (2905, 6884), (3442, 5810)]