20813683615 has 8 divisors (see below), whose sum is σ = 25018120800. Its totient is φ = 16623146592.

The previous prime is 20813683613. The next prime is 20813683621. The reversal of 20813683615 is 51638631802.

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 20813683615 - 2¹ = 20813683613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813683613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3471744 + ... + 3477733.

It is an arithmetic number, because the mean of its divisors is an integer number (3127265100).

Almost surely, 2^20813683615 is an apocalyptic number.

20813683615 is a deficient number, since it is larger than the sum of its proper divisors (4204437185).

20813683615 is an equidigital number, since it uses as much as digits as its factorization.

20813683615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6950081.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 20813683615 in words is "twenty billion, eight hundred thirteen million, six hundred eighty-three thousand, six hundred fifteen".