20503874 has 4 divisors (see below), whose sum is σ = 30755814. Its totient is φ = 10251936.

The previous prime is 20503871. The next prime is 20503937. The reversal of 20503874 is 47830502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47830502 = 2 ⋅23915251.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 208849 = 4505^2 + 457^2 .

It is not an unprimeable number, because it can be changed into a prime (20503871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5125967 + ... + 5125970.

Almost surely, 2^20503874 is an apocalyptic number.

20503874 is a deficient number, since it is larger than the sum of its proper divisors (10251940).

20503874 is a wasteful number, since it uses less digits than its factorization.

20503874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10251939.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20503874 is about 4528.1203605911. The cubic root of 20503874 is about 273.7024225956.

The spelling of 20503874 in words is "twenty million, five hundred three thousand, eight hundred seventy-four".