21581140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{1109}}^1$

素因数の和:1264

約数の個数: 48

約数和(自身を含む): 52214400

約数和(自身を除く): 30633260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 139, 140, 278, 556, 695, 973, 1109, 1390, 1946, 2218, 2780, 3892, 4436, 4865, 5545, 7763, 9730, 11090, 15526, 19460, 22180, 31052, 38815, 77630, 154151, 155260, 308302, 616604, 770755, 1079057, 1541510, 2158114, 3083020, 4316228, 5395285, 10790570, 21581140]

約数ペア:

[(1, 21581140), (2, 10790570), (4, 5395285), (5, 4316228), (7, 3083020), (10, 2158114), (14, 1541510), (20, 1079057), (28, 770755), (35, 616604), (70, 308302), (139, 155260), (140, 154151), (278, 77630), (556, 38815), (695, 31052), (973, 22180), (1109, 19460), (1390, 15526), (1946, 11090), (2218, 9730), (2780, 7763), (3892, 5545), (4436, 4865)]