21240940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{173}}^1\times {\mathrm{877}}^1$

素因数の和:1066

約数の個数: 48

約数和(自身を含む): 51331392

約数和(自身を除く): 30090452

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 173, 346, 692, 865, 877, 1211, 1730, 1754, 2422, 3460, 3508, 4385, 4844, 6055, 6139, 8770, 12110, 12278, 17540, 24220, 24556, 30695, 61390, 122780, 151721, 303442, 606884, 758605, 1062047, 1517210, 2124094, 3034420, 4248188, 5310235, 10620470, 21240940]

約数ペア:

[(1, 21240940), (2, 10620470), (4, 5310235), (5, 4248188), (7, 3034420), (10, 2124094), (14, 1517210), (20, 1062047), (28, 758605), (35, 606884), (70, 303442), (140, 151721), (173, 122780), (346, 61390), (692, 30695), (865, 24556), (877, 24220), (1211, 17540), (1730, 12278), (1754, 12110), (2422, 8770), (3460, 6139), (3508, 6055), (4385, 4844)]