20431531606 has 4 divisors (see below), whose sum is σ = 30647297412. Its totient is φ = 10215765802.

The previous prime is 20431531597. The next prime is 20431531607. The reversal of 20431531606 is 60613513402.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431531607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5107882900 + ... + 5107882903.

It is an arithmetic number, because the mean of its divisors is an integer number (7661824353).

Almost surely, 2^20431531606 is an apocalyptic number.

20431531606 is a deficient number, since it is larger than the sum of its proper divisors (10215765806).

20431531606 is a wasteful number, since it uses less digits than its factorization.

20431531606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215765805.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 20431531606 in words is "twenty billion, four hundred thirty-one million, five hundred thirty-one thousand, six hundred six".