20250220861 has 32 divisors (see below), whose sum is σ = 23056846848. Its totient is φ = 17653489920.

The previous prime is 20250220841. The next prime is 20250220889. The reversal of 20250220861 is 16802205202.

It is a cyclic number.

It is not a de Polignac number, because 20250220861 - 2⁵ = 20250220829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20250220841) 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, 7518231 + ... + 7520923.

It is an arithmetic number, because the mean of its divisors is an integer number (720526464).

Almost surely, 2^20250220861 is an apocalyptic number.

It is an amenable number.

20250220861 is a deficient number, since it is larger than the sum of its proper divisors (2806625987).

20250220861 is a wasteful number, since it uses less digits than its factorization.

20250220861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 20250220861 in words is "twenty billion, two hundred fifty million, two hundred twenty thousand, eight hundred sixty-one".