20464667501 has 4 divisors (see below), whose sum is σ = 20464959072. Its totient is φ = 20464375932.

The previous prime is 20464667491. The next prime is 20464667521. The reversal of 20464667501 is 10576646402.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20464667501 - 2²² = 20460473197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464667521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30770 + ... + 204636.

It is an arithmetic number, because the mean of its divisors is an integer number (5116239768).

Almost surely, 2^20464667501 is an apocalyptic number.

It is an amenable number.

20464667501 is a deficient number, since it is larger than the sum of its proper divisors (291571).

20464667501 is a wasteful number, since it uses less digits than its factorization.

20464667501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291570.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 20464667501 in words is "twenty billion, four hundred sixty-four million, six hundred sixty-seven thousand, five hundred one".