18900000021

素因数分解:

$3^1\times 7^1\times {\mathrm{409}}^1\times {\mathrm{2200489}}^1$

素因数の和:2200908

約数の個数: 16

約数和(自身を含む): 28870428800

約数和(自身を除く): 9970428779

約数列:

[1, 3, 7, 21, 409, 1227, 2863, 8589, 2200489, 6601467, 15403423, 46210269, 900000001, 2700000003, 6300000007, 18900000021]

約数ペア:

[(1, 18900000021), (3, 6300000007), (7, 2700000003), (21, 900000001), (409, 46210269), (1227, 15403423), (2863, 6601467), (8589, 2200489)]