20765600

素因数分解:

$2^5\times 5^2\times {\mathrm{101}}^1\times {\mathrm{257}}^1$

素因数の和:378

約数の個数: 72

約数和(自身を含む): 51395148

約数和(自身を除く): 30629548

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 101, 160, 200, 202, 257, 400, 404, 505, 514, 800, 808, 1010, 1028, 1285, 1616, 2020, 2056, 2525, 2570, 3232, 4040, 4112, 5050, 5140, 6425, 8080, 8224, 10100, 10280, 12850, 16160, 20200, 20560, 25700, 25957, 40400, 41120, 51400, 51914, 80800, 102800, 103828, 129785, 205600, 207656, 259570, 415312, 519140, 648925, 830624, 1038280, 1297850, 2076560, 2595700, 4153120, 5191400, 10382800, 20765600]

約数ペア:

[(1, 20765600), (2, 10382800), (4, 5191400), (5, 4153120), (8, 2595700), (10, 2076560), (16, 1297850), (20, 1038280), (25, 830624), (32, 648925), (40, 519140), (50, 415312), (80, 259570), (100, 207656), (101, 205600), (160, 129785), (200, 103828), (202, 102800), (257, 80800), (400, 51914), (404, 51400), (505, 41120), (514, 40400), (800, 25957), (808, 25700), (1010, 20560), (1028, 20200), (1285, 16160), (1616, 12850), (2020, 10280), (2056, 10100), (2525, 8224), (2570, 8080), (3232, 6425), (4040, 5140), (4112, 5050)]