19810280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{509}}^1$

素因数の和:666

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 31597720

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 139, 140, 278, 280, 509, 556, 695, 973, 1018, 1112, 1390, 1946, 2036, 2545, 2780, 3563, 3892, 4072, 4865, 5090, 5560, 7126, 7784, 9730, 10180, 14252, 17815, 19460, 20360, 28504, 35630, 38920, 70751, 71260, 141502, 142520, 283004, 353755, 495257, 566008, 707510, 990514, 1415020, 1981028, 2476285, 2830040, 3962056, 4952570, 9905140, 19810280]

約数ペア:

[(1, 19810280), (2, 9905140), (4, 4952570), (5, 3962056), (7, 2830040), (8, 2476285), (10, 1981028), (14, 1415020), (20, 990514), (28, 707510), (35, 566008), (40, 495257), (56, 353755), (70, 283004), (139, 142520), (140, 141502), (278, 71260), (280, 70751), (509, 38920), (556, 35630), (695, 28504), (973, 20360), (1018, 19460), (1112, 17815), (1390, 14252), (1946, 10180), (2036, 9730), (2545, 7784), (2780, 7126), (3563, 5560), (3892, 5090), (4072, 4865)]