20475387823 has 16 divisors (see below), whose sum is σ = 22888438272. Its totient is φ = 18154552000.

The previous prime is 20475387799. The next prime is 20475387847. The reversal of 20475387823 is 32878357402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20475387799) and next prime (20475387847).

It is a cyclic number.

It is not a de Polignac number, because 20475387823 - 2⁹ = 20475387311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475387223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2658408 + ... + 2666098.

It is an arithmetic number, because the mean of its divisors is an integer number (1430527392).

Almost surely, 2^20475387823 is an apocalyptic number.

20475387823 is a deficient number, since it is larger than the sum of its proper divisors (2413050449).

20475387823 is a wasteful number, since it uses less digits than its factorization.

20475387823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13646.

The product of its (nonzero) digits is 2257920, while the sum is 49.

The spelling of 20475387823 in words is "twenty billion, four hundred seventy-five million, three hundred eighty-seven thousand, eight hundred twenty-three".