20400875

素因数分解:

$5^3\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{401}}^1$

素因数の和:464

約数の個数: 32

約数和(自身を含む): 28596672

約数和(自身を除く): 8195797

約数列:

[1, 5, 11, 25, 37, 55, 125, 185, 275, 401, 407, 925, 1375, 2005, 2035, 4411, 4625, 10025, 10175, 14837, 22055, 50125, 50875, 74185, 110275, 163207, 370925, 551375, 816035, 1854625, 4080175, 20400875]

約数ペア:

[(1, 20400875), (5, 4080175), (11, 1854625), (25, 816035), (37, 551375), (55, 370925), (125, 163207), (185, 110275), (275, 74185), (401, 50875), (407, 50125), (925, 22055), (1375, 14837), (2005, 10175), (2035, 10025), (4411, 4625)]