20987800

素因数分解:

$2^3\times 5^2\times {\mathrm{101}}^1\times {\mathrm{1039}}^1$

素因数の和:1156

約数の個数: 48

約数和(自身を含む): 49327200

約数和(自身を除く): 28339400

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 101, 200, 202, 404, 505, 808, 1010, 1039, 2020, 2078, 2525, 4040, 4156, 5050, 5195, 8312, 10100, 10390, 20200, 20780, 25975, 41560, 51950, 103900, 104939, 207800, 209878, 419756, 524695, 839512, 1049390, 2098780, 2623475, 4197560, 5246950, 10493900, 20987800]

約数ペア:

[(1, 20987800), (2, 10493900), (4, 5246950), (5, 4197560), (8, 2623475), (10, 2098780), (20, 1049390), (25, 839512), (40, 524695), (50, 419756), (100, 209878), (101, 207800), (200, 104939), (202, 103900), (404, 51950), (505, 41560), (808, 25975), (1010, 20780), (1039, 20200), (2020, 10390), (2078, 10100), (2525, 8312), (4040, 5195), (4156, 5050)]