19982781

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2711}}^1$

素因数の和:2743

約数の個数: 40

約数和(自身を含む): 36753024

約数和(自身を除く): 16770243

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 63, 81, 91, 117, 189, 273, 351, 567, 819, 1053, 2457, 2711, 7371, 8133, 18977, 24399, 35243, 56931, 73197, 105729, 170793, 219591, 246701, 317187, 512379, 740103, 951561, 1537137, 2220309, 2854683, 6660927, 19982781]

約数ペア:

[(1, 19982781), (3, 6660927), (7, 2854683), (9, 2220309), (13, 1537137), (21, 951561), (27, 740103), (39, 512379), (63, 317187), (81, 246701), (91, 219591), (117, 170793), (189, 105729), (273, 73197), (351, 56931), (567, 35243), (819, 24399), (1053, 18977), (2457, 8133), (2711, 7371)]