20444542137 has 12 divisors (see below), whose sum is σ = 29533973040. Its totient is φ = 13628325048.

The previous prime is 20444542123. The next prime is 20444542199. The reversal of 20444542137 is 73124544402.

20444542137 is a `hidden beast` number, since 204 + 445 + 4 + 2 + 1 + 3 + 7 = 666.

It is not a de Polignac number, because 20444542137 - 2¹⁰ = 20444541113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20444542037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15087 + ... + 202772.

It is an arithmetic number, because the mean of its divisors is an integer number (2461164420).

Almost surely, 2^20444542137 is an apocalyptic number.

It is an amenable number.

20444542137 is a deficient number, since it is larger than the sum of its proper divisors (9089430903).

20444542137 is a wasteful number, since it uses less digits than its factorization.

20444542137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228292 (or 228289 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

The spelling of 20444542137 in words is "twenty billion, four hundred forty-four million, five hundred forty-two thousand, one hundred thirty-seven".