20251622149 has 4 divisors (see below), whose sum is σ = 22092678720. Its totient is φ = 18410565580.

The previous prime is 20251622077. The next prime is 20251622159. The reversal of 20251622149 is 94122615202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20251622149 - 2²³ = 20243233541 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 (20251622159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920528269 + ... + 920528290.

It is an arithmetic number, because the mean of its divisors is an integer number (5523169680).

Almost surely, 2^20251622149 is an apocalyptic number.

It is an amenable number.

20251622149 is a deficient number, since it is larger than the sum of its proper divisors (1841056571).

20251622149 is a wasteful number, since it uses less digits than its factorization.

20251622149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841056570.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20251622149 in words is "twenty billion, two hundred fifty-one million, six hundred twenty-two thousand, one hundred forty-nine".