19984000

素因数分解:

$2^7\times 5^3\times {\mathrm{1249}}^1$

素因数の和:1278

約数の個数: 64

約数和(自身を含む): 49725000

約数和(自身を除く): 29741000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1249, 1600, 2000, 2498, 3200, 4000, 4996, 6245, 8000, 9992, 12490, 16000, 19984, 24980, 31225, 39968, 49960, 62450, 79936, 99920, 124900, 156125, 159872, 199840, 249800, 312250, 399680, 499600, 624500, 799360, 999200, 1249000, 1998400, 2498000, 3996800, 4996000, 9992000, 19984000]

約数ペア:

[(1, 19984000), (2, 9992000), (4, 4996000), (5, 3996800), (8, 2498000), (10, 1998400), (16, 1249000), (20, 999200), (25, 799360), (32, 624500), (40, 499600), (50, 399680), (64, 312250), (80, 249800), (100, 199840), (125, 159872), (128, 156125), (160, 124900), (200, 99920), (250, 79936), (320, 62450), (400, 49960), (500, 39968), (640, 31225), (800, 24980), (1000, 19984), (1249, 16000), (1600, 12490), (2000, 9992), (2498, 8000), (3200, 6245), (4000, 4996)]