20611280

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8311}}^1$

素因数の和:8355

約数の個数: 40

約数和(自身を含む): 49473024

約数和(自身を除く): 28861744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8311, 16622, 33244, 41555, 66488, 83110, 132976, 166220, 257641, 332440, 515282, 664880, 1030564, 1288205, 2061128, 2576410, 4122256, 5152820, 10305640, 20611280]

約数ペア:

[(1, 20611280), (2, 10305640), (4, 5152820), (5, 4122256), (8, 2576410), (10, 2061128), (16, 1288205), (20, 1030564), (31, 664880), (40, 515282), (62, 332440), (80, 257641), (124, 166220), (155, 132976), (248, 83110), (310, 66488), (496, 41555), (620, 33244), (1240, 16622), (2480, 8311)]