20867140

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{199}}^1$

素因数の和:329

約数の個数: 72

約数和(自身を含む): 51710400

約数和(自身を除く): 30843260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 107, 140, 196, 199, 214, 245, 398, 428, 490, 535, 749, 796, 980, 995, 1070, 1393, 1498, 1990, 2140, 2786, 2996, 3745, 3980, 5243, 5572, 6965, 7490, 9751, 10486, 13930, 14980, 19502, 20972, 21293, 26215, 27860, 39004, 42586, 48755, 52430, 85172, 97510, 104860, 106465, 149051, 195020, 212930, 298102, 425860, 596204, 745255, 1043357, 1490510, 2086714, 2981020, 4173428, 5216785, 10433570, 20867140]

約数ペア:

[(1, 20867140), (2, 10433570), (4, 5216785), (5, 4173428), (7, 2981020), (10, 2086714), (14, 1490510), (20, 1043357), (28, 745255), (35, 596204), (49, 425860), (70, 298102), (98, 212930), (107, 195020), (140, 149051), (196, 106465), (199, 104860), (214, 97510), (245, 85172), (398, 52430), (428, 48755), (490, 42586), (535, 39004), (749, 27860), (796, 26215), (980, 21293), (995, 20972), (1070, 19502), (1393, 14980), (1498, 13930), (1990, 10486), (2140, 9751), (2786, 7490), (2996, 6965), (3745, 5572), (3980, 5243)]