20513771773 has 16 divisors (see below), whose sum is σ = 23078545920. Its totient is φ = 18074551600.

The previous prime is 20513771767. The next prime is 20513771827. The reversal of 20513771773 is 37717731502.

It is a cyclic number.

It is not a de Polignac number, because 20513771773 - 2³³ = 11923837181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513771753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176515 + ... + 268672.

It is an arithmetic number, because the mean of its divisors is an integer number (1442409120).

Almost surely, 2^20513771773 is an apocalyptic number.

It is an amenable number.

20513771773 is a deficient number, since it is larger than the sum of its proper divisors (2564774147).

20513771773 is a wasteful number, since it uses less digits than its factorization.

20513771773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445328.

The product of its (nonzero) digits is 216090, while the sum is 43.

The spelling of 20513771773 in words is "twenty billion, five hundred thirteen million, seven hundred seventy-one thousand, seven hundred seventy-three".