20781020202 has 64 divisors (see below), whose sum is σ = 43054792704. Its totient is φ = 6683152320.

The previous prime is 20781020189. The next prime is 20781020207. The reversal of 20781020202 is 20202018702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20781020207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5798103 + ... + 5801685.

It is an arithmetic number, because the mean of its divisors is an integer number (672731136).

Almost surely, 2^20781020202 is an apocalyptic number.

20781020202 is an abundant number, since it is smaller than the sum of its proper divisors (22273772502).

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

20781020202 is a wasteful number, since it uses less digits than its factorization.

20781020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923.

The product of its (nonzero) digits is 896, while the sum is 24.

Adding to 20781020202 its reverse (20202018702), we get a palindrome (40983038904).

The spelling of 20781020202 in words is "twenty billion, seven hundred eighty-one million, twenty thousand, two hundred two".