79999600

素因数分解:

$2^4\times 5^2\times {\mathrm{199999}}^1$

素因数の和:200017

約数の個数: 30

約数和(自身を含む): 192200000

約数和(自身を除く): 112200400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 199999, 399998, 799996, 999995, 1599992, 1999990, 3199984, 3999980, 4999975, 7999960, 9999950, 15999920, 19999900, 39999800, 79999600]

約数ペア:

[(1, 79999600), (2, 39999800), (4, 19999900), (5, 15999920), (8, 9999950), (10, 7999960), (16, 4999975), (20, 3999980), (25, 3199984), (40, 1999990), (50, 1599992), (80, 999995), (100, 799996), (200, 399998), (400, 199999)]