20781020201 has 16 divisors (see below), whose sum is σ = 22286949120. Its totient is φ = 19307312640.

The previous prime is 20781020189. The next prime is 20781020207. The reversal of 20781020201 is 10202018702.

It is a cyclic number.

It is not a de Polignac number, because 20781020201 - 2³⁰ = 19707278377 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 943820 + ... + 965586.

It is an arithmetic number, because the mean of its divisors is an integer number (1392934320).

Almost surely, 2^20781020201 is an apocalyptic number.

It is an amenable number.

20781020201 is a deficient number, since it is larger than the sum of its proper divisors (1505928919).

20781020201 is a wasteful number, since it uses less digits than its factorization.

20781020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22504.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 20781020201 its reverse (10202018702), we get a palindrome (30983038903).

The spelling of 20781020201 in words is "twenty billion, seven hundred eighty-one million, twenty thousand, two hundred one".