20505002819 has 16 divisors (see below), whose sum is σ = 23534221056. Its totient is φ = 17500903200.

The previous prime is 20505002801. The next prime is 20505002821. The reversal of 20505002819 is 91820050502.

It is a cyclic number.

It is not a de Polignac number, because 20505002819 - 2²⁸ = 20236567363 is a prime.

It is a super-2 number, since 2×20505002819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20505002519) 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, 2026964 + ... + 2037054.

It is an arithmetic number, because the mean of its divisors is an integer number (1470888816).

Almost surely, 2^20505002819 is an apocalyptic number.

20505002819 is a deficient number, since it is larger than the sum of its proper divisors (3029218237).

20505002819 is a wasteful number, since it uses less digits than its factorization.

20505002819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11306.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 20505002819 in words is "twenty billion, five hundred five million, two thousand, eight hundred nineteen".