19907921

素因数分解:

${\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{739}}^1$

素因数の和:860

約数の個数: 16

約数和(自身を含む): 22732800

約数和(自身を除く): 2824879

約数列:

[1, 11, 31, 79, 341, 739, 869, 2449, 8129, 22909, 26939, 58381, 251999, 642191, 1809811, 19907921]

約数ペア:

[(1, 19907921), (11, 1809811), (31, 642191), (79, 251999), (341, 58381), (739, 26939), (869, 22909), (2449, 8129)]