21721980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{51719}}^1$

素因数の和:51738

約数の個数: 48

約数和(自身を含む): 69511680

約数和(自身を除く): 47789700

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 51719, 103438, 155157, 206876, 258595, 310314, 362033, 517190, 620628, 724066, 775785, 1034380, 1086099, 1448132, 1551570, 1810165, 2172198, 3103140, 3620330, 4344396, 5430495, 7240660, 10860990, 21721980]

約数ペア:

[(1, 21721980), (2, 10860990), (3, 7240660), (4, 5430495), (5, 4344396), (6, 3620330), (7, 3103140), (10, 2172198), (12, 1810165), (14, 1551570), (15, 1448132), (20, 1086099), (21, 1034380), (28, 775785), (30, 724066), (35, 620628), (42, 517190), (60, 362033), (70, 310314), (84, 258595), (105, 206876), (140, 155157), (210, 103438), (420, 51719)]