20503634 has 4 divisors (see below), whose sum is σ = 30755454. Its totient is φ = 10251816.

The previous prime is 20503627. The next prime is 20503673. The reversal of 20503634 is 43630502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43630502 = 2 ⋅21815251.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 3073009 = 4175^2 + 1753^2 .

It is a super-3 number, since 3×20503634³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5125907 + ... + 5125910.

Almost surely, 2^20503634 is an apocalyptic number.

20503634 is a deficient number, since it is larger than the sum of its proper divisors (10251820).

20503634 is a wasteful number, since it uses less digits than its factorization.

20503634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10251819.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20503634 is about 4528.0938594512. The cubic root of 20503634 is about 273.7013546862.

The spelling of 20503634 in words is "twenty million, five hundred three thousand, six hundred thirty-four".