20783987693 has 8 divisors (see below), whose sum is σ = 24305527488. Its totient is φ = 17400547584.

The previous prime is 20783987681. The next prime is 20783987713. The reversal of 20783987693 is 39678938702.

It is a happy number.

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

It is not a de Polignac number, because 20783987693 - 2⁸ = 20783987437 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 (20783987663) 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, 34524596 + ... + 34525197.

It is an arithmetic number, because the mean of its divisors is an integer number (3038190936).

Almost surely, 2^20783987693 is an apocalyptic number.

It is an amenable number.

20783987693 is a deficient number, since it is larger than the sum of its proper divisors (3521539795).

20783987693 is an equidigital number, since it uses as much as digits as its factorization.

20783987693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69049843.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 20783987693 in words is "twenty billion, seven hundred eighty-three million, nine hundred eighty-seven thousand, six hundred ninety-three".