20547623668 has 36 divisors (see below), whose sum is σ = 42476894208. Its totient is φ = 8621377440.

The previous prime is 20547623653. The next prime is 20547623671. The reversal of 20547623668 is 86632674502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374196 + ... + 1389067.

It is an arithmetic number, because the mean of its divisors is an integer number (1179913728).

Almost surely, 2^20547623668 is an apocalyptic number.

It is an amenable number.

20547623668 is an abundant number, since it is smaller than the sum of its proper divisors (21929270540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20547623668 is a wasteful number, since it uses less digits than its factorization.

20547623668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763304 (or 2763289 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 20547623668 in words is "twenty billion, five hundred forty-seven million, six hundred twenty-three thousand, six hundred sixty-eight".