20516156 has 6 divisors (see below), whose sum is σ = 35903280. Its totient is φ = 10258076.

The previous prime is 20516149. The next prime is 20516173. The reversal of 20516156 is 65161502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564516 + ... + 2564523.

It is an arithmetic number, because the mean of its divisors is an integer number (5983880).

Almost surely, 2^20516156 is an apocalyptic number.

It is an amenable number.

20516156 is a deficient number, since it is larger than the sum of its proper divisors (15387124).

20516156 is a wasteful number, since it uses less digits than its factorization.

20516156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129043 (or 5129041 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20516156 is about 4529.4763494250. The cubic root of 20516156 is about 273.7570617362.

Adding to 20516156 its reverse (65161502), we get a palindrome (85677658).

It can be divided in two parts, 205 and 16156, that added together give a palindrome (16361).

The spelling of 20516156 in words is "twenty million, five hundred sixteen thousand, one hundred fifty-six".