20400531739 has 8 divisors (see below), whose sum is σ = 24066987008. Its totient is φ = 16922099880.

The previous prime is 20400531731. The next prime is 20400531773. The reversal of 20400531739 is 93713500402.

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

It is not a de Polignac number, because 20400531739 - 2³ = 20400531731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400531731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47005617 + ... + 47006050.

It is an arithmetic number, because the mean of its divisors is an integer number (3008373376).

Almost surely, 2^20400531739 is an apocalyptic number.

20400531739 is a deficient number, since it is larger than the sum of its proper divisors (3666455269).

20400531739 is an equidigital number, since it uses as much as digits as its factorization.

20400531739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94011705.

The product of its (nonzero) digits is 22680, while the sum is 34.

The spelling of 20400531739 in words is "twenty billion, four hundred million, five hundred thirty-one thousand, seven hundred thirty-nine".