20788000

素因数分解:

$2^5\times 5^3\times {\mathrm{5197}}^1$

素因数の和:5222

約数の個数: 48

約数和(自身を含む): 51085944

約数和(自身を除く): 30297944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 800, 1000, 2000, 4000, 5197, 10394, 20788, 25985, 41576, 51970, 83152, 103940, 129925, 166304, 207880, 259850, 415760, 519700, 649625, 831520, 1039400, 1299250, 2078800, 2598500, 4157600, 5197000, 10394000, 20788000]

約数ペア:

[(1, 20788000), (2, 10394000), (4, 5197000), (5, 4157600), (8, 2598500), (10, 2078800), (16, 1299250), (20, 1039400), (25, 831520), (32, 649625), (40, 519700), (50, 415760), (80, 259850), (100, 207880), (125, 166304), (160, 129925), (200, 103940), (250, 83152), (400, 51970), (500, 41576), (800, 25985), (1000, 20788), (2000, 10394), (4000, 5197)]