20505280

素因数分解:

$2^6\times 5^1\times {\mathrm{139}}^1\times {\mathrm{461}}^1$

素因数の和:617

約数の個数: 56

約数和(自身を含む): 49286160

約数和(自身を除く): 28780880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 139, 160, 278, 320, 461, 556, 695, 922, 1112, 1390, 1844, 2224, 2305, 2780, 3688, 4448, 4610, 5560, 7376, 8896, 9220, 11120, 14752, 18440, 22240, 29504, 36880, 44480, 64079, 73760, 128158, 147520, 256316, 320395, 512632, 640790, 1025264, 1281580, 2050528, 2563160, 4101056, 5126320, 10252640, 20505280]

約数ペア:

[(1, 20505280), (2, 10252640), (4, 5126320), (5, 4101056), (8, 2563160), (10, 2050528), (16, 1281580), (20, 1025264), (32, 640790), (40, 512632), (64, 320395), (80, 256316), (139, 147520), (160, 128158), (278, 73760), (320, 64079), (461, 44480), (556, 36880), (695, 29504), (922, 22240), (1112, 18440), (1390, 14752), (1844, 11120), (2224, 9220), (2305, 8896), (2780, 7376), (3688, 5560), (4448, 4610)]