398769920

素因数分解:

$2^8\times 5^1\times {\mathrm{311539}}^1$

素因数の和:311560

約数の個数: 36

約数和(自身を含む): 955181640

約数和(自身を除く): 556411720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 311539, 623078, 1246156, 1557695, 2492312, 3115390, 4984624, 6230780, 9969248, 12461560, 19938496, 24923120, 39876992, 49846240, 79753984, 99692480, 199384960, 398769920]

約数ペア:

[(1, 398769920), (2, 199384960), (4, 99692480), (5, 79753984), (8, 49846240), (10, 39876992), (16, 24923120), (20, 19938496), (32, 12461560), (40, 9969248), (64, 6230780), (80, 4984624), (128, 3115390), (160, 2492312), (256, 1557695), (320, 1246156), (640, 623078), (1280, 311539)]