20950640

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1019}}^1$

素因数の和:1289

約数の個数: 40

約数和(自身を含む): 48947760

約数和(自身を除く): 27997120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1019, 1028, 1285, 2038, 2056, 2570, 4076, 4112, 5095, 5140, 8152, 10190, 10280, 16304, 20380, 20560, 40760, 81520, 261883, 523766, 1047532, 1309415, 2095064, 2618830, 4190128, 5237660, 10475320, 20950640]

約数ペア:

[(1, 20950640), (2, 10475320), (4, 5237660), (5, 4190128), (8, 2618830), (10, 2095064), (16, 1309415), (20, 1047532), (40, 523766), (80, 261883), (257, 81520), (514, 40760), (1019, 20560), (1028, 20380), (1285, 16304), (2038, 10280), (2056, 10190), (2570, 8152), (4076, 5140), (4112, 5095)]