20767500436 has 6 divisors (see below), whose sum is σ = 36343125770. Its totient is φ = 10383750216.

The previous prime is 20767500433. The next prime is 20767500437. The reversal of 20767500436 is 63400576702.

It can be written as a sum of positive squares in only one way, i.e., 18011250436 + 2756250000 = 134206^2 + 52500^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20767500433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2595937551 + ... + 2595937558.

Almost surely, 2^20767500436 is an apocalyptic number.

It is an amenable number.

20767500436 is a deficient number, since it is larger than the sum of its proper divisors (15575625334).

20767500436 is a wasteful number, since it uses less digits than its factorization.

20767500436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191875113 (or 5191875111 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 20767500436 in words is "twenty billion, seven hundred sixty-seven million, five hundred thousand, four hundred thirty-six".