20742690836 has 24 divisors (see below), whose sum is σ = 41739902400. Its totient is φ = 8835184512.

The previous prime is 20742690827. The next prime is 20742690863. The reversal of 20742690836 is 63809624702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2267861 + ... + 2276988.

It is an arithmetic number, because the mean of its divisors is an integer number (1739162600).

Almost surely, 2^20742690836 is an apocalyptic number.

It is an amenable number.

20742690836 is an abundant number, since it is smaller than the sum of its proper divisors (20997211564).

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

20742690836 is a wasteful number, since it uses less digits than its factorization.

20742690836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545023 (or 4545021 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 20742690836 in words is "twenty billion, seven hundred forty-two million, six hundred ninety thousand, eight hundred thirty-six".