20687540

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{547}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 45663744

約数和(自身を除く): 24976204

約数列:

[1, 2, 4, 5, 10, 20, 31, 61, 62, 122, 124, 155, 244, 305, 310, 547, 610, 620, 1094, 1220, 1891, 2188, 2735, 3782, 5470, 7564, 9455, 10940, 16957, 18910, 33367, 33914, 37820, 66734, 67828, 84785, 133468, 166835, 169570, 333670, 339140, 667340, 1034377, 2068754, 4137508, 5171885, 10343770, 20687540]

約数ペア:

[(1, 20687540), (2, 10343770), (4, 5171885), (5, 4137508), (10, 2068754), (20, 1034377), (31, 667340), (61, 339140), (62, 333670), (122, 169570), (124, 166835), (155, 133468), (244, 84785), (305, 67828), (310, 66734), (547, 37820), (610, 33914), (620, 33367), (1094, 18910), (1220, 16957), (1891, 10940), (2188, 9455), (2735, 7564), (3782, 5470)]