20506513044 has 12 divisors (see below), whose sum is σ = 47848530464. Its totient is φ = 6835504344.

The previous prime is 20506513043. The next prime is 20506513057. The reversal of 20506513044 is 44031560502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506513043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854438032 + ... + 854438055.

Almost surely, 2^20506513044 is an apocalyptic number.

It is an amenable number.

20506513044 is an abundant number, since it is smaller than the sum of its proper divisors (27342017420).

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

20506513044 is a wasteful number, since it uses less digits than its factorization.

20506513044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708876094 (or 1708876092 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 20506513044 in words is "twenty billion, five hundred six million, five hundred thirteen thousand, forty-four".