20200000

素因数分解:

$2^6\times 5^5\times {\mathrm{101}}^1$

素因数の和:138

約数の個数: 84

約数和(自身を含む): 50598324

約数和(自身を除く): 30398324

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 101, 125, 160, 200, 202, 250, 320, 400, 404, 500, 505, 625, 800, 808, 1000, 1010, 1250, 1600, 1616, 2000, 2020, 2500, 2525, 3125, 3232, 4000, 4040, 5000, 5050, 6250, 6464, 8000, 8080, 10000, 10100, 12500, 12625, 16160, 20000, 20200, 25000, 25250, 32320, 40000, 40400, 50000, 50500, 63125, 80800, 100000, 101000, 126250, 161600, 200000, 202000, 252500, 315625, 404000, 505000, 631250, 808000, 1010000, 1262500, 2020000, 2525000, 4040000, 5050000, 10100000, 20200000]

約数ペア:

[(1, 20200000), (2, 10100000), (4, 5050000), (5, 4040000), (8, 2525000), (10, 2020000), (16, 1262500), (20, 1010000), (25, 808000), (32, 631250), (40, 505000), (50, 404000), (64, 315625), (80, 252500), (100, 202000), (101, 200000), (125, 161600), (160, 126250), (200, 101000), (202, 100000), (250, 80800), (320, 63125), (400, 50500), (404, 50000), (500, 40400), (505, 40000), (625, 32320), (800, 25250), (808, 25000), (1000, 20200), (1010, 20000), (1250, 16160), (1600, 12625), (1616, 12500), (2000, 10100), (2020, 10000), (2500, 8080), (2525, 8000), (3125, 6464), (3232, 6250), (4000, 5050), (4040, 5000)]