20705000

素因数分解:

$2^3\times 5^4\times {\mathrm{41}}^1\times {\mathrm{101}}^1$

素因数の和:168

約数の個数: 80

約数和(自身を含む): 50187060

約数和(自身を除く): 29482060

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 41, 50, 82, 100, 101, 125, 164, 200, 202, 205, 250, 328, 404, 410, 500, 505, 625, 808, 820, 1000, 1010, 1025, 1250, 1640, 2020, 2050, 2500, 2525, 4040, 4100, 4141, 5000, 5050, 5125, 8200, 8282, 10100, 10250, 12625, 16564, 20200, 20500, 20705, 25250, 25625, 33128, 41000, 41410, 50500, 51250, 63125, 82820, 101000, 102500, 103525, 126250, 165640, 205000, 207050, 252500, 414100, 505000, 517625, 828200, 1035250, 2070500, 2588125, 4141000, 5176250, 10352500, 20705000]

約数ペア:

[(1, 20705000), (2, 10352500), (4, 5176250), (5, 4141000), (8, 2588125), (10, 2070500), (20, 1035250), (25, 828200), (40, 517625), (41, 505000), (50, 414100), (82, 252500), (100, 207050), (101, 205000), (125, 165640), (164, 126250), (200, 103525), (202, 102500), (205, 101000), (250, 82820), (328, 63125), (404, 51250), (410, 50500), (500, 41410), (505, 41000), (625, 33128), (808, 25625), (820, 25250), (1000, 20705), (1010, 20500), (1025, 20200), (1250, 16564), (1640, 12625), (2020, 10250), (2050, 10100), (2500, 8282), (2525, 8200), (4040, 5125), (4100, 5050), (4141, 5000)]