20740611836 has 24 divisors (see below), whose sum is σ = 43284756480. Its totient is φ = 8502362352.

The previous prime is 20740611809. The next prime is 20740611839. The reversal of 20740611836 is 63811604702.

It is a self number, because there is not a number n which added to its sum of digits gives 20740611836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740611839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16102316 + ... + 16103603.

It is an arithmetic number, because the mean of its divisors is an integer number (1803531520).

Almost surely, 2^20740611836 is an apocalyptic number.

It is an amenable number.

20740611836 is an abundant number, since it is smaller than the sum of its proper divisors (22544144644).

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

20740611836 is a wasteful number, since it uses less digits than its factorization.

20740611836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32205953 (or 32205951 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20740611836 in words is "twenty billion, seven hundred forty million, six hundred eleven thousand, eight hundred thirty-six".