20754640

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4253}}^1$

素因数の和:4327

約数の個数: 40

約数和(自身を含む): 49057128

約数和(自身を除く): 28302488

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4253, 4880, 8506, 17012, 21265, 34024, 42530, 68048, 85060, 170120, 259433, 340240, 518866, 1037732, 1297165, 2075464, 2594330, 4150928, 5188660, 10377320, 20754640]

約数ペア:

[(1, 20754640), (2, 10377320), (4, 5188660), (5, 4150928), (8, 2594330), (10, 2075464), (16, 1297165), (20, 1037732), (40, 518866), (61, 340240), (80, 259433), (122, 170120), (244, 85060), (305, 68048), (488, 42530), (610, 34024), (976, 21265), (1220, 17012), (2440, 8506), (4253, 4880)]