19996990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{1523}}^1$

素因数の和:1644

約数の個数: 32

約数和(自身を含む): 39172896

約数和(自身を除く): 19175906

約数列:

[1, 2, 5, 10, 13, 26, 65, 101, 130, 202, 505, 1010, 1313, 1523, 2626, 3046, 6565, 7615, 13130, 15230, 19799, 39598, 98995, 153823, 197990, 307646, 769115, 1538230, 1999699, 3999398, 9998495, 19996990]

約数ペア:

[(1, 19996990), (2, 9998495), (5, 3999398), (10, 1999699), (13, 1538230), (26, 769115), (65, 307646), (101, 197990), (130, 153823), (202, 98995), (505, 39598), (1010, 19799), (1313, 15230), (1523, 13130), (2626, 7615), (3046, 6565)]