20728120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{181}}^1\times {\mathrm{409}}^1$

素因数の和:608

約数の個数: 64

約数和(自身を含む): 53726400

約数和(自身を除く): 32998280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 181, 280, 362, 409, 724, 818, 905, 1267, 1448, 1636, 1810, 2045, 2534, 2863, 3272, 3620, 4090, 5068, 5726, 6335, 7240, 8180, 10136, 11452, 12670, 14315, 16360, 22904, 25340, 28630, 50680, 57260, 74029, 114520, 148058, 296116, 370145, 518203, 592232, 740290, 1036406, 1480580, 2072812, 2591015, 2961160, 4145624, 5182030, 10364060, 20728120]

約数ペア:

[(1, 20728120), (2, 10364060), (4, 5182030), (5, 4145624), (7, 2961160), (8, 2591015), (10, 2072812), (14, 1480580), (20, 1036406), (28, 740290), (35, 592232), (40, 518203), (56, 370145), (70, 296116), (140, 148058), (181, 114520), (280, 74029), (362, 57260), (409, 50680), (724, 28630), (818, 25340), (905, 22904), (1267, 16360), (1448, 14315), (1636, 12670), (1810, 11452), (2045, 10136), (2534, 8180), (2863, 7240), (3272, 6335), (3620, 5726), (4090, 5068)]