20786288493 has 8 divisors (see below), whose sum is σ = 27716078656. Its totient is φ = 13857012000.

The previous prime is 20786288461. The next prime is 20786288503. The reversal of 20786288493 is 39488268702.

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 20786288493 - 2⁵ = 20786288461 is a prime.

It is a super-2 number, since 2×20786288493² (a number of 21 digits) contains 22 as substring.

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 (20786288293) 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, 21208 + ... + 204993.

It is an arithmetic number, because the mean of its divisors is an integer number (3464509832).

Almost surely, 2^20786288493 is an apocalyptic number.

It is an amenable number.

20786288493 is a deficient number, since it is larger than the sum of its proper divisors (6929790163).

20786288493 is a wasteful number, since it uses less digits than its factorization.

20786288493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256835.

The product of its (nonzero) digits is 9289728, while the sum is 57.

The spelling of 20786288493 in words is "twenty billion, seven hundred eighty-six million, two hundred eighty-eight thousand, four hundred ninety-three".