399778880

素因数分解:

$2^6\times 5^1\times {\mathrm{641}}^1\times {\mathrm{1949}}^1$

素因数の和:2607

約数の個数: 56

約数和(自身を含む): 953947800

約数和(自身を除く): 554168920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 641, 1282, 1949, 2564, 3205, 3898, 5128, 6410, 7796, 9745, 10256, 12820, 15592, 19490, 20512, 25640, 31184, 38980, 41024, 51280, 62368, 77960, 102560, 124736, 155920, 205120, 311840, 623680, 1249309, 2498618, 4997236, 6246545, 9994472, 12493090, 19988944, 24986180, 39977888, 49972360, 79955776, 99944720, 199889440, 399778880]

約数ペア:

[(1, 399778880), (2, 199889440), (4, 99944720), (5, 79955776), (8, 49972360), (10, 39977888), (16, 24986180), (20, 19988944), (32, 12493090), (40, 9994472), (64, 6246545), (80, 4997236), (160, 2498618), (320, 1249309), (641, 623680), (1282, 311840), (1949, 205120), (2564, 155920), (3205, 124736), (3898, 102560), (5128, 77960), (6410, 62368), (7796, 51280), (9745, 41024), (10256, 38980), (12820, 31184), (15592, 25640), (19490, 20512)]