21554757

素因数分解:

$3^2\times 7^2\times {\mathrm{37}}^1\times {\mathrm{1321}}^1$

素因数の和:1378

約数の個数: 36

約数和(自身を含む): 37224876

約数和(自身を除く): 15670119

約数列:

[1, 3, 7, 9, 21, 37, 49, 63, 111, 147, 259, 333, 441, 777, 1321, 1813, 2331, 3963, 5439, 9247, 11889, 16317, 27741, 48877, 64729, 83223, 146631, 194187, 342139, 439893, 582561, 1026417, 2394973, 3079251, 7184919, 21554757]

約数ペア:

[(1, 21554757), (3, 7184919), (7, 3079251), (9, 2394973), (21, 1026417), (37, 582561), (49, 439893), (63, 342139), (111, 194187), (147, 146631), (259, 83223), (333, 64729), (441, 48877), (777, 27741), (1321, 16317), (1813, 11889), (2331, 9247), (3963, 5439)]