20603405064 has 32 divisors (see below), whose sum is σ = 56191105440. Its totient is φ = 6243456000.

The previous prime is 20603405063. The next prime is 20603405089. The reversal of 20603405064 is 46050430602.

It is not an unprimeable number, because it can be changed into a prime (20603405063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39021337 + ... + 39021864.

It is an arithmetic number, because the mean of its divisors is an integer number (1755972045).

Almost surely, 2^20603405064 is an apocalyptic number.

20603405064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20603405064 is an abundant number, since it is smaller than the sum of its proper divisors (35587700376).

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

20603405064 is a wasteful number, since it uses less digits than its factorization.

20603405064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78043221 (or 78043217 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 20603405064 its reverse (46050430602), we get a palindrome (66653835666).

The spelling of 20603405064 in words is "twenty billion, six hundred three million, four hundred five thousand, sixty-four".