20773428636 has 12 divisors (see below), whose sum is σ = 48471333512. Its totient is φ = 6924476208.

The previous prime is 20773428617. The next prime is 20773428667. The reversal of 20773428636 is 63682437702.

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

It is a congruent number.

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, 865559515 + ... + 865559538.

Almost surely, 2^20773428636 is an apocalyptic number.

It is an amenable number.

20773428636 is an abundant number, since it is smaller than the sum of its proper divisors (27697904876).

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

20773428636 is a wasteful number, since it uses less digits than its factorization.

20773428636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731119060 (or 1731119058 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 20773428636 in words is "twenty billion, seven hundred seventy-three million, four hundred twenty-eight thousand, six hundred thirty-six".