639280

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:205

約数の個数: 40

約数和(自身を含む): 1522224

約数和(自身を除く): 882944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 131, 244, 262, 305, 488, 524, 610, 655, 976, 1048, 1220, 1310, 2096, 2440, 2620, 4880, 5240, 7991, 10480, 15982, 31964, 39955, 63928, 79910, 127856, 159820, 319640, 639280]

約数ペア:

[(1, 639280), (2, 319640), (4, 159820), (5, 127856), (8, 79910), (10, 63928), (16, 39955), (20, 31964), (40, 15982), (61, 10480), (80, 7991), (122, 5240), (131, 4880), (244, 2620), (262, 2440), (305, 2096), (488, 1310), (524, 1220), (610, 1048), (655, 976)]