20511325451 has 4 divisors (see below), whose sum is σ = 20515880952. Its totient is φ = 20506769952.

The previous prime is 20511325441. The next prime is 20511325463. The reversal of 20511325451 is 15452311502.

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 20511325451 - 2²² = 20507131147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511325421) 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, 2270990 + ... + 2280003.

It is an arithmetic number, because the mean of its divisors is an integer number (5128970238).

Almost surely, 2^20511325451 is an apocalyptic number.

20511325451 is a deficient number, since it is larger than the sum of its proper divisors (4555501).

20511325451 is an equidigital number, since it uses as much as digits as its factorization.

20511325451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555500.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 20511325451 its reverse (15452311502), we get a palindrome (35963636953).

The spelling of 20511325451 in words is "twenty billion, five hundred eleven million, three hundred twenty-five thousand, four hundred fifty-one".