20556534146 has 4 divisors (see below), whose sum is σ = 30834801222. Its totient is φ = 10278267072.

The previous prime is 20556534139. The next prime is 20556534157. The reversal of 20556534146 is 64143565502.

It is a happy number.

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., 20546068921 + 10465225 = 143339^2 + 3235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139133535 + ... + 5139133538.

Almost surely, 2^20556534146 is an apocalyptic number.

20556534146 is a deficient number, since it is larger than the sum of its proper divisors (10278267076).

20556534146 is a wasteful number, since it uses less digits than its factorization.

20556534146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278267075.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20556534146 in words is "twenty billion, five hundred fifty-six million, five hundred thirty-four thousand, one hundred forty-six".