20339761 has 4 divisors (see below), whose sum is σ = 21904372. Its totient is φ = 18775152.

The previous prime is 20339749. The next prime is 20339789. The reversal of 20339761 is 16793302.

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 1547536 + 18792225 = 1244^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20339761 - 2⁵ = 20339729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20339741) 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, 782286 + ... + 782311.

It is an arithmetic number, because the mean of its divisors is an integer number (5476093).

Almost surely, 2^20339761 is an apocalyptic number.

It is an amenable number.

20339761 is a deficient number, since it is larger than the sum of its proper divisors (1564611).

20339761 is a wasteful number, since it uses less digits than its factorization.

20339761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564610.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20339761 is about 4509.9624166948. The cubic root of 20339761 is about 272.9702275806.

The spelling of 20339761 in words is "twenty million, three hundred thirty-nine thousand, seven hundred sixty-one".