20526400064 has 28 divisors (see below), whose sum is σ = 41725545708. Its totient is φ = 10012876800.

The previous prime is 20526400057. The next prime is 20526400123. The reversal of 20526400064 is 46000462502.

It can be written as a sum of positive squares in 2 ways, for example, as 3647193664 + 16879206400 = 60392^2 + 129920^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3908657 + ... + 3913904.

It is an arithmetic number, because the mean of its divisors is an integer number (1490198061).

Almost surely, 2^20526400064 is an apocalyptic number.

It is an amenable number.

20526400064 is an abundant number, since it is smaller than the sum of its proper divisors (21199145644).

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

20526400064 is an equidigital number, since it uses as much as digits as its factorization.

20526400064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822614 (or 7822604 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 20526400064 its reverse (46000462502), we get a palindrome (66526862566).

The spelling of 20526400064 in words is "twenty billion, five hundred twenty-six million, four hundred thousand, sixty-four".