21790815

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{157}}^1\times {\mathrm{487}}^1$

素因数の和:671

約数の個数: 32

約数和(自身を含む): 37009920

約数和(自身を除く): 15219105

約数列:

[1, 3, 5, 15, 19, 57, 95, 157, 285, 471, 487, 785, 1461, 2355, 2435, 2983, 7305, 8949, 9253, 14915, 27759, 44745, 46265, 76459, 138795, 229377, 382295, 1146885, 1452721, 4358163, 7263605, 21790815]

約数ペア:

[(1, 21790815), (3, 7263605), (5, 4358163), (15, 1452721), (19, 1146885), (57, 382295), (95, 229377), (157, 138795), (285, 76459), (471, 46265), (487, 44745), (785, 27759), (1461, 14915), (2355, 9253), (2435, 8949), (2983, 7305)]