20011541251 has 4 divisors (see below), whose sum is σ = 21550890592. Its totient is φ = 18472191912.

The previous prime is 20011541243. The next prime is 20011541261. The reversal of 20011541251 is 15214511002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15214511002 = 2 ⋅7607255501.

It is a cyclic number.

It is not a de Polignac number, because 20011541251 - 2³ = 20011541243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011541261) 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, 769674651 + ... + 769674676.

It is an arithmetic number, because the mean of its divisors is an integer number (5387722648).

Almost surely, 2^20011541251 is an apocalyptic number.

20011541251 is a deficient number, since it is larger than the sum of its proper divisors (1539349341).

20011541251 is a wasteful number, since it uses less digits than its factorization.

20011541251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539349340.

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 20011541251 in words is "twenty billion, eleven million, five hundred forty-one thousand, two hundred fifty-one".