20645203074 has 16 divisors (see below), whose sum is σ = 41291874912. Its totient is φ = 6881489568.

The previous prime is 20645203039. The next prime is 20645203079. The reversal of 20645203074 is 47030254602.

It is not an unprimeable number, because it can be changed into a prime (20645203079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223197 + ... + 301839.

It is an arithmetic number, because the mean of its divisors is an integer number (2580742182).

Almost surely, 2^20645203074 is an apocalyptic number.

20645203074 is an abundant number, since it is smaller than the sum of its proper divisors (20646671838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20645203074 is a wasteful number, since it uses less digits than its factorization.

20645203074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122401.

The product of its (nonzero) digits is 40320, while the sum is 33.

Adding to 20645203074 its reverse (47030254602), we get a palindrome (67675457676).

The spelling of 20645203074 in words is "twenty billion, six hundred forty-five million, two hundred three thousand, seventy-four".