20657420

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{197}}^1$

素因数の和:327

約数の個数: 72

約数和(自身を含む): 51193296

約数和(自身を除く): 30535876

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 107, 140, 196, 197, 214, 245, 394, 428, 490, 535, 749, 788, 980, 985, 1070, 1379, 1498, 1970, 2140, 2758, 2996, 3745, 3940, 5243, 5516, 6895, 7490, 9653, 10486, 13790, 14980, 19306, 20972, 21079, 26215, 27580, 38612, 42158, 48265, 52430, 84316, 96530, 104860, 105395, 147553, 193060, 210790, 295106, 421580, 590212, 737765, 1032871, 1475530, 2065742, 2951060, 4131484, 5164355, 10328710, 20657420]

約数ペア:

[(1, 20657420), (2, 10328710), (4, 5164355), (5, 4131484), (7, 2951060), (10, 2065742), (14, 1475530), (20, 1032871), (28, 737765), (35, 590212), (49, 421580), (70, 295106), (98, 210790), (107, 193060), (140, 147553), (196, 105395), (197, 104860), (214, 96530), (245, 84316), (394, 52430), (428, 48265), (490, 42158), (535, 38612), (749, 27580), (788, 26215), (980, 21079), (985, 20972), (1070, 19306), (1379, 14980), (1498, 13790), (1970, 10486), (2140, 9653), (2758, 7490), (2996, 6895), (3745, 5516), (3940, 5243)]