20257994 has 4 divisors (see below), whose sum is σ = 30386994. Its totient is φ = 10128996.

The previous prime is 20257949. The next prime is 20257997. The reversal of 20257994 is 49975202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11992369 + 8265625 = 3463^2 + 2875^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20257997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064497 + ... + 5064500.

Almost surely, 2^20257994 is an apocalyptic number.

20257994 is a deficient number, since it is larger than the sum of its proper divisors (10129000).

20257994 is a wasteful number, since it uses less digits than its factorization.

20257994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10128999.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20257994 is about 4500.8881345797. Note that the first 3 decimals coincide. The cubic root of 20257994 is about 272.6039510260.

The spelling of 20257994 in words is "twenty million, two hundred fifty-seven thousand, nine hundred ninety-four".