20807737257 has 8 divisors (see below), whose sum is σ = 27745309984. Its totient is φ = 13870994688.

The previous prime is 20807737229. The next prime is 20807737271. The reversal of 20807737257 is 75273770802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20807737257 - 2¹¹ = 20807735209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20807737217) 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, 146488 + ... + 251145.

It is an arithmetic number, because the mean of its divisors is an integer number (3468163748).

Almost surely, 2^20807737257 is an apocalyptic number.

It is an amenable number.

20807737257 is a deficient number, since it is larger than the sum of its proper divisors (6937572727).

20807737257 is a wasteful number, since it uses less digits than its factorization.

20807737257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415079.

The product of its (nonzero) digits is 1152480, while the sum is 48.

The spelling of 20807737257 in words is "twenty billion, eight hundred seven million, seven hundred thirty-seven thousand, two hundred fifty-seven".