20320400552 has 32 divisors (see below), whose sum is σ = 40071905280. Its totient is φ = 9646927680.

The previous prime is 20320400483. The next prime is 20320400561. The reversal of 20320400552 is 25500402302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759848 + ... + 786135.

It is an arithmetic number, because the mean of its divisors is an integer number (1252247040).

Almost surely, 2^20320400552 is an apocalyptic number.

It is an amenable number.

20320400552 is a deficient number, since it is larger than the sum of its proper divisors (19751504728).

20320400552 is a wasteful number, since it uses less digits than its factorization.

20320400552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546073 (or 1546069 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

Adding to 20320400552 its reverse (25500402302), we get a palindrome (45820802854).

The spelling of 20320400552 in words is "twenty billion, three hundred twenty million, four hundred thousand, five hundred fifty-two".