20001523251 has 4 divisors (see below), whose sum is σ = 26668697672. Its totient is φ = 13334348832.

The previous prime is 20001523249. The next prime is 20001523253. The reversal of 20001523251 is 15232510002.

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

It is an interprime number because it is at equal distance from previous prime (20001523249) and next prime (20001523253).

It is not a de Polignac number, because 20001523251 - 2¹ = 20001523249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001523253) 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, 3333587206 + ... + 3333587211.

It is an arithmetic number, because the mean of its divisors is an integer number (6667174418).

Almost surely, 2^20001523251 is an apocalyptic number.

20001523251 is a deficient number, since it is larger than the sum of its proper divisors (6667174421).

20001523251 is an equidigital number, since it uses as much as digits as its factorization.

20001523251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667174420.

The product of its (nonzero) digits is 600, while the sum is 21.

It can be divided in two parts, 2000 and 1523251, that added together give a palindrome (1525251).

The spelling of 20001523251 in words is "twenty billion, one million, five hundred twenty-three thousand, two hundred fifty-one".