20983521

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{149}}^1\times {\mathrm{157}}^1$

素因数の和:345

約数の個数: 32

約数和(自身を含む): 31852800

約数和(自身を除く): 10869279

約数列:

[1, 3, 13, 23, 39, 69, 149, 157, 299, 447, 471, 897, 1937, 2041, 3427, 3611, 5811, 6123, 10281, 10833, 23393, 44551, 46943, 70179, 133653, 140829, 304109, 538039, 912327, 1614117, 6994507, 20983521]

約数ペア:

[(1, 20983521), (3, 6994507), (13, 1614117), (23, 912327), (39, 538039), (69, 304109), (149, 140829), (157, 133653), (299, 70179), (447, 46943), (471, 44551), (897, 23393), (1937, 10833), (2041, 10281), (3427, 6123), (3611, 5811)]