78400

素因数分解:

$2^6\times 5^2\times 7^2$

素因数の和:36

約数の個数: 63

約数和(自身を含む): 224409

約数和(自身を除く): 146009

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 40, 49, 50, 56, 64, 70, 80, 98, 100, 112, 140, 160, 175, 196, 200, 224, 245, 280, 320, 350, 392, 400, 448, 490, 560, 700, 784, 800, 980, 1120, 1225, 1400, 1568, 1600, 1960, 2240, 2450, 2800, 3136, 3920, 4900, 5600, 7840, 9800, 11200, 15680, 19600, 39200, 78400]

約数ペア:

[(1, 78400), (2, 39200), (4, 19600), (5, 15680), (7, 11200), (8, 9800), (10, 7840), (14, 5600), (16, 4900), (20, 3920), (25, 3136), (28, 2800), (32, 2450), (35, 2240), (40, 1960), (49, 1600), (50, 1568), (56, 1400), (64, 1225), (70, 1120), (80, 980), (98, 800), (100, 784), (112, 700), (140, 560), (160, 490), (175, 448), (196, 400), (200, 392), (224, 350), (245, 320)]