20767502893 has 4 divisors (see below), whose sum is σ = 21051989308. Its totient is φ = 20483016480.

The previous prime is 20767502879. The next prime is 20767502963. The reversal of 20767502893 is 39820576702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17653639689 + 3113863204 = 132867^2 + 55802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20767502893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20767502803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142243098 + ... + 142243243.

It is an arithmetic number, because the mean of its divisors is an integer number (5262997327).

Almost surely, 2^20767502893 is an apocalyptic number.

It is an amenable number.

20767502893 is a deficient number, since it is larger than the sum of its proper divisors (284486415).

20767502893 is an equidigital number, since it uses as much as digits as its factorization.

20767502893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284486414.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 20767502893 in words is "twenty billion, seven hundred sixty-seven million, five hundred two thousand, eight hundred ninety-three".