20494257 has 16 divisors (see below), whose sum is σ = 31554432. Its totient is φ = 11589120.

The previous prime is 20494237. The next prime is 20494283. The reversal of 20494257 is 75249402.

It is not a de Polignac number, because 20494257 - 2¹² = 20490161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20494207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2994 + ... + 7067.

It is an arithmetic number, because the mean of its divisors is an integer number (1972152).

Almost surely, 2^20494257 is an apocalyptic number.

It is an amenable number.

20494257 is a deficient number, since it is larger than the sum of its proper divisors (11060175).

20494257 is a wasteful number, since it uses less digits than its factorization.

20494257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20494257 is about 4527.0583163905. The cubic root of 20494257 is about 273.6596240520.

The spelling of 20494257 in words is "twenty million, four hundred ninety-four thousand, two hundred fifty-seven".