20342761 has 4 divisors (see below), whose sum is σ = 21539412. Its totient is φ = 19146112.

The previous prime is 20342759. The next prime is 20342767. The reversal of 20342761 is 16724302.

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 6325225 + 14017536 = 2515^2 + 3744^2 .

It is a cyclic number.

It is not a de Polignac number, because 20342761 - 2¹ = 20342759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20342767) 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, 598300 + ... + 598333.

It is an arithmetic number, because the mean of its divisors is an integer number (5384853).

Almost surely, 2^20342761 is an apocalyptic number.

It is an amenable number.

20342761 is a deficient number, since it is larger than the sum of its proper divisors (1196651).

20342761 is a wasteful number, since it uses less digits than its factorization.

20342761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196650.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20342761 is about 4510.2950014384. The cubic root of 20342761 is about 272.9836474437.

The spelling of 20342761 in words is "twenty million, three hundred forty-two thousand, seven hundred sixty-one".