20516763 has 4 divisors (see below), whose sum is σ = 27355688. Its totient is φ = 13677840.

The previous prime is 20516753. The next prime is 20516791. The reversal of 20516763 is 36761502.

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

It is not a de Polignac number, because 20516763 - 2¹⁰ = 20515739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20516763.

It is not an unprimeable number, because it can be changed into a prime (20516753) 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, 3419458 + ... + 3419463.

It is an arithmetic number, because the mean of its divisors is an integer number (6838922).

Almost surely, 2^20516763 is an apocalyptic number.

20516763 is a deficient number, since it is larger than the sum of its proper divisors (6838925).

20516763 is an equidigital number, since it uses as much as digits as its factorization.

20516763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838924.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20516763 is about 4529.5433544674. The cubic root of 20516763 is about 273.7597615418.

The spelling of 20516763 in words is "twenty million, five hundred sixteen thousand, seven hundred sixty-three".