19810420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1993}}^1$

素因数の和:2080

約数の個数: 48

約数和(自身を含む): 48238848

約数和(自身を除く): 28428428

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 1993, 2485, 3986, 4970, 7972, 9940, 9965, 13951, 19930, 27902, 39860, 55804, 69755, 139510, 141503, 279020, 283006, 566012, 707515, 990521, 1415030, 1981042, 2830060, 3962084, 4952605, 9905210, 19810420]

約数ペア:

[(1, 19810420), (2, 9905210), (4, 4952605), (5, 3962084), (7, 2830060), (10, 1981042), (14, 1415030), (20, 990521), (28, 707515), (35, 566012), (70, 283006), (71, 279020), (140, 141503), (142, 139510), (284, 69755), (355, 55804), (497, 39860), (710, 27902), (994, 19930), (1420, 13951), (1988, 9965), (1993, 9940), (2485, 7972), (3986, 4970)]