20494765 has 4 divisors (see below), whose sum is σ = 24593724. Its totient is φ = 16395808.

The previous prime is 20494763. The next prime is 20494769. The reversal of 20494765 is 56749402.

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 2762244 + 17732521 = 1662^2 + 4211^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494765 - 2¹ = 20494763 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 (20494763) 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, 2049472 + ... + 2049481.

It is an arithmetic number, because the mean of its divisors is an integer number (6148431).

Almost surely, 2^20494765 is an apocalyptic number.

It is an amenable number.

20494765 is a deficient number, since it is larger than the sum of its proper divisors (4098959).

20494765 is an equidigital number, since it uses as much as digits as its factorization.

20494765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098958.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20494765 is about 4527.1144231177. The cubic root of 20494765 is about 273.6618851397.

The spelling of 20494765 in words is "twenty million, four hundred ninety-four thousand, seven hundred sixty-five".