20764061 has 4 divisors (see below), whose sum is σ = 20775132. Its totient is φ = 20752992.

The previous prime is 20764057. The next prime is 20764063. The reversal of 20764061 is 16046702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2325625 + 18438436 = 1525^2 + 4294^2 .

It is a cyclic number.

It is not a de Polignac number, because 20764061 - 2² = 20764057 is a prime.

It is a super-2 number, since 2×20764061² = 862292458423442, which contains 22 as substring.

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 20764061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764063) 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, 1946 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (5193783).

Almost surely, 2^20764061 is an apocalyptic number.

It is an amenable number.

20764061 is a deficient number, since it is larger than the sum of its proper divisors (11071).

20764061 is an equidigital number, since it uses as much as digits as its factorization.

20764061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20764061 is about 4556.7599234544. The cubic root of 20764061 is about 274.8552891527.

The spelling of 20764061 in words is "twenty million, seven hundred sixty-four thousand, sixty-one".