20505188830 has 32 divisors (see below), whose sum is σ = 42214081536. Its totient is φ = 7025020704.

The previous prime is 20505188749. The next prime is 20505188861. The reversal of 20505188830 is 3888150502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17484 + ... + 203263.

It is an arithmetic number, because the mean of its divisors is an integer number (1319190048).

Almost surely, 2^20505188830 is an apocalyptic number.

20505188830 is an abundant number, since it is smaller than the sum of its proper divisors (21708892706).

20505188830 is a wasteful number, since it uses less digits than its factorization.

20505188830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222088.

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 20505188830 in words is "twenty billion, five hundred five million, one hundred eighty-eight thousand, eight hundred thirty".