20987380

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{83}}^1\times {\mathrm{269}}^1$

素因数の和:408

約数の個数: 48

約数和(自身を含む): 45722880

約数和(自身を除く): 24735500

約数列:

[1, 2, 4, 5, 10, 20, 47, 83, 94, 166, 188, 235, 269, 332, 415, 470, 538, 830, 940, 1076, 1345, 1660, 2690, 3901, 5380, 7802, 12643, 15604, 19505, 22327, 25286, 39010, 44654, 50572, 63215, 78020, 89308, 111635, 126430, 223270, 252860, 446540, 1049369, 2098738, 4197476, 5246845, 10493690, 20987380]

約数ペア:

[(1, 20987380), (2, 10493690), (4, 5246845), (5, 4197476), (10, 2098738), (20, 1049369), (47, 446540), (83, 252860), (94, 223270), (166, 126430), (188, 111635), (235, 89308), (269, 78020), (332, 63215), (415, 50572), (470, 44654), (538, 39010), (830, 25286), (940, 22327), (1076, 19505), (1345, 15604), (1660, 12643), (2690, 7802), (3901, 5380)]