20475487823 has 32 divisors (see below), whose sum is σ = 24583329792. Its totient is φ = 16674134400.

The previous prime is 20475487811. The next prime is 20475487843. The reversal of 20475487823 is 32878457402.

It is not a de Polignac number, because 20475487823 - 2¹⁰ = 20475486799 is a prime.

It is a super-3 number, since 3×20475487823³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475487843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19859318 + ... + 19860348.

It is an arithmetic number, because the mean of its divisors is an integer number (768229056).

Almost surely, 2^20475487823 is an apocalyptic number.

20475487823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20475487823 is a deficient number, since it is larger than the sum of its proper divisors (4107841969).

20475487823 is a wasteful number, since it uses less digits than its factorization.

20475487823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 20475487823 in words is "twenty billion, four hundred seventy-five million, four hundred eighty-seven thousand, eight hundred twenty-three".