20891627836 has 12 divisors (see below), whose sum is σ = 36696262680. Its totient is φ = 10406981360.

The previous prime is 20891627831. The next prime is 20891627863. The reversal of 20891627836 is 63872619802.

It is a super-2 number, since 2×20891627836² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891627831) 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, 9706930 + ... + 9709081.

It is an arithmetic number, because the mean of its divisors is an integer number (3058021890).

Almost surely, 2^20891627836 is an apocalyptic number.

It is an amenable number.

20891627836 is a deficient number, since it is larger than the sum of its proper divisors (15804634844).

20891627836 is a wasteful number, since it uses less digits than its factorization.

20891627836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19416284 (or 19416282 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 20891627836 in words is "twenty billion, eight hundred ninety-one million, six hundred twenty-seven thousand, eight hundred thirty-six".