20877009123 has 4 divisors (see below), whose sum is σ = 27836012168. Its totient is φ = 13918006080.

The previous prime is 20877009119. The next prime is 20877009133. The reversal of 20877009123 is 32190077802.

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

It is not a de Polignac number, because 20877009123 - 2² = 20877009119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20877009113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3479501518 + ... + 3479501523.

It is an arithmetic number, because the mean of its divisors is an integer number (6959003042).

Almost surely, 2^20877009123 is an apocalyptic number.

20877009123 is a deficient number, since it is larger than the sum of its proper divisors (6959003045).

20877009123 is an equidigital number, since it uses as much as digits as its factorization.

20877009123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6959003044.

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 20877009123 in words is "twenty billion, eight hundred seventy-seven million, nine thousand, one hundred twenty-three".