20508535200890 has 32 divisors (see below), whose sum is σ = 40421012999040. Its totient is φ = 7429925550400.

The previous prime is 20508535200821. The next prime is 20508535200931. The reversal of 20508535200890 is 9800253580502.

It is a happy number.

It is a super-2 number, since 2×20508535200890² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346515446 + ... + 346574625.

It is an arithmetic number, because the mean of its divisors is an integer number (1263156656220).

Almost surely, 2^{20508535200890} is an apocalyptic number.

20508535200890 is a deficient number, since it is larger than the sum of its proper divisors (19912477798150).

20508535200890 is a wasteful number, since it uses less digits than its factorization.

20508535200890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693090358.

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 20508535200890 in words is "twenty trillion, five hundred eight billion, five hundred thirty-five million, two hundred thousand, eight hundred ninety".