399680

素因数分解:

$2^6\times 5^1\times {\mathrm{1249}}^1$

素因数の和:1266

約数の個数: 28

約数和(自身を含む): 952500

約数和(自身を除く): 552820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 1249, 2498, 4996, 6245, 9992, 12490, 19984, 24980, 39968, 49960, 79936, 99920, 199840, 399680]

約数ペア:

[(1, 399680), (2, 199840), (4, 99920), (5, 79936), (8, 49960), (10, 39968), (16, 24980), (20, 19984), (32, 12490), (40, 9992), (64, 6245), (80, 4996), (160, 2498), (320, 1249)]