20834501251 has 4 divisors (see below), whose sum is σ = 20836175104. Its totient is φ = 20832827400.

The previous prime is 20834501213. The next prime is 20834501279. The reversal of 20834501251 is 15210543802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20834501251 - 2²⁷ = 20700283523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20834501551) 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, 818115 + ... + 843196.

It is an arithmetic number, because the mean of its divisors is an integer number (5209043776).

Almost surely, 2^20834501251 is an apocalyptic number.

20834501251 is a deficient number, since it is larger than the sum of its proper divisors (1673853).

20834501251 is a wasteful number, since it uses less digits than its factorization.

20834501251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673852.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 20834501251 in words is "twenty billion, eight hundred thirty-four million, five hundred one thousand, two hundred fifty-one".