20493132806 has 16 divisors (see below), whose sum is σ = 31309595280. Its totient is φ = 10057144320.

The previous prime is 20493132797. The next prime is 20493132809. The reversal of 20493132806 is 60823139402.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20493132806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20493132809) 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, 59831 + ... + 211106.

It is an arithmetic number, because the mean of its divisors is an integer number (1956849705).

Almost surely, 2^20493132806 is an apocalyptic number.

20493132806 is a deficient number, since it is larger than the sum of its proper divisors (10816462474).

20493132806 is a wasteful number, since it uses less digits than its factorization.

20493132806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271639.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 20493132806 in words is "twenty billion, four hundred ninety-three million, one hundred thirty-two thousand, eight hundred six".