20451631615 has 8 divisors (see below), whose sum is σ = 24649129440. Its totient is φ = 16289857632.

The previous prime is 20451631591. The next prime is 20451631631. The reversal of 20451631615 is 51613615402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20451631615 - 2¹¹ = 20451629567 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8929699 + ... + 8931988.

It is an arithmetic number, because the mean of its divisors is an integer number (3081141180).

Almost surely, 2^20451631615 is an apocalyptic number.

20451631615 is a deficient number, since it is larger than the sum of its proper divisors (4197497825).

20451631615 is a wasteful number, since it uses less digits than its factorization.

20451631615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17861921.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 20451631615 in words is "twenty billion, four hundred fifty-one million, six hundred thirty-one thousand, six hundred fifteen".