20557003 has 2 divisors, whose sum is σ = 20557004. Its totient is φ = 20557002.

The previous prime is 20556979. The next prime is 20557013. The reversal of 20557003 is 30075502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20557003 - 2⁵ = 20556971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20557013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278501 + 10278502.

It is an arithmetic number, because the mean of its divisors is an integer number (10278502).

Almost surely, 2^20557003 is an apocalyptic number.

20557003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20557003 is an equidigital number, since it uses as much as digits as its factorization.

20557003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 20557003 is about 4533.9831274499. The cubic root of 20557003 is about 273.9386217678.

The spelling of 20557003 in words is "twenty million, five hundred fifty-seven thousand, three".