19801990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{8017}}^1$

素因数の和:8056

約数の個数: 32

約数和(自身を含む): 40410720

約数和(自身を除く): 20608730

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 65, 95, 130, 190, 247, 494, 1235, 2470, 8017, 16034, 40085, 80170, 104221, 152323, 208442, 304646, 521105, 761615, 1042210, 1523230, 1980199, 3960398, 9900995, 19801990]

約数ペア:

[(1, 19801990), (2, 9900995), (5, 3960398), (10, 1980199), (13, 1523230), (19, 1042210), (26, 761615), (38, 521105), (65, 304646), (95, 208442), (130, 152323), (190, 104221), (247, 80170), (494, 40085), (1235, 16034), (2470, 8017)]