20831238747 has 40 divisors (see below), whose sum is σ = 33989746032. Its totient is φ = 12609172800.

The previous prime is 20831238731. The next prime is 20831238749. The reversal of 20831238747 is 74783213802.

It is not a de Polignac number, because 20831238747 - 2⁴ = 20831238731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20831238749) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 717273 + ... + 745749.

Almost surely, 2^20831238747 is an apocalyptic number.

20831238747 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20831238747 is a deficient number, since it is larger than the sum of its proper divisors (13158507285).

20831238747 is a wasteful number, since it uses less digits than its factorization.

20831238747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29321 (or 29312 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 20831238747 in words is "twenty billion, eight hundred thirty-one million, two hundred thirty-eight thousand, seven hundred forty-seven".