28744520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{251}}^1\times {\mathrm{409}}^1$

素因数の和:678

約数の個数: 64

約数和(自身を含む): 74390400

約数和(自身を除く): 45645880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 251, 280, 409, 502, 818, 1004, 1255, 1636, 1757, 2008, 2045, 2510, 2863, 3272, 3514, 4090, 5020, 5726, 7028, 8180, 8785, 10040, 11452, 14056, 14315, 16360, 17570, 22904, 28630, 35140, 57260, 70280, 102659, 114520, 205318, 410636, 513295, 718613, 821272, 1026590, 1437226, 2053180, 2874452, 3593065, 4106360, 5748904, 7186130, 14372260, 28744520]

約数ペア:

[(1, 28744520), (2, 14372260), (4, 7186130), (5, 5748904), (7, 4106360), (8, 3593065), (10, 2874452), (14, 2053180), (20, 1437226), (28, 1026590), (35, 821272), (40, 718613), (56, 513295), (70, 410636), (140, 205318), (251, 114520), (280, 102659), (409, 70280), (502, 57260), (818, 35140), (1004, 28630), (1255, 22904), (1636, 17570), (1757, 16360), (2008, 14315), (2045, 14056), (2510, 11452), (2863, 10040), (3272, 8785), (3514, 8180), (4090, 7028), (5020, 5726)]