20761730890 has 16 divisors (see below), whose sum is σ = 37464317640. Its totient is φ = 8283980800.

The previous prime is 20761730881. The next prime is 20761730903. The reversal of 20761730890 is 9803716702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20399551929 + 362178961 = 142827^2 + 19031^2 .

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, 2584735 + ... + 2592754.

Almost surely, 2^20761730890 is an apocalyptic number.

20761730890 is a deficient number, since it is larger than the sum of its proper divisors (16702586750).

20761730890 is a wasteful number, since it uses less digits than its factorization.

20761730890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5177897.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20761730890 in words is "twenty billion, seven hundred sixty-one million, seven hundred thirty thousand, eight hundred ninety".