21397980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{5023}}^1$

素因数の和:5106

約数の個数: 48

約数和(自身を含む): 60770304

約数和(自身を除く): 39372324

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 71, 142, 213, 284, 355, 426, 710, 852, 1065, 1420, 2130, 4260, 5023, 10046, 15069, 20092, 25115, 30138, 50230, 60276, 75345, 100460, 150690, 301380, 356633, 713266, 1069899, 1426532, 1783165, 2139798, 3566330, 4279596, 5349495, 7132660, 10698990, 21397980]

約数ペア:

[(1, 21397980), (2, 10698990), (3, 7132660), (4, 5349495), (5, 4279596), (6, 3566330), (10, 2139798), (12, 1783165), (15, 1426532), (20, 1069899), (30, 713266), (60, 356633), (71, 301380), (142, 150690), (213, 100460), (284, 75345), (355, 60276), (426, 50230), (710, 30138), (852, 25115), (1065, 20092), (1420, 15069), (2130, 10046), (4260, 5023)]