20518880

素因数分解:

$2^5\times 5^1\times {\mathrm{257}}^1\times {\mathrm{499}}^1$

素因数の和:771

約数の個数: 48

約数和(自身を含む): 48762000

約数和(自身を除く): 28243120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 257, 499, 514, 998, 1028, 1285, 1996, 2056, 2495, 2570, 3992, 4112, 4990, 5140, 7984, 8224, 9980, 10280, 15968, 19960, 20560, 39920, 41120, 79840, 128243, 256486, 512972, 641215, 1025944, 1282430, 2051888, 2564860, 4103776, 5129720, 10259440, 20518880]

約数ペア:

[(1, 20518880), (2, 10259440), (4, 5129720), (5, 4103776), (8, 2564860), (10, 2051888), (16, 1282430), (20, 1025944), (32, 641215), (40, 512972), (80, 256486), (160, 128243), (257, 79840), (499, 41120), (514, 39920), (998, 20560), (1028, 19960), (1285, 15968), (1996, 10280), (2056, 9980), (2495, 8224), (2570, 7984), (3992, 5140), (4112, 4990)]