20442737 has 4 divisors (see below), whose sum is σ = 23363136. Its totient is φ = 17522340.

The previous prime is 20442731. The next prime is 20442739. The reversal of 20442737 is 73724402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20442737 - 2¹⁸ = 20180593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442731) 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, 1460189 + ... + 1460202.

It is an arithmetic number, because the mean of its divisors is an integer number (5840784).

Almost surely, 2^20442737 is an apocalyptic number.

It is an amenable number.

20442737 is a deficient number, since it is larger than the sum of its proper divisors (2920399).

20442737 is an equidigital number, since it uses as much as digits as its factorization.

20442737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920398.

The product of its (nonzero) digits is 9408, while the sum is 29.

The square root of 20442737 is about 4521.3645064294. The cubic root of 20442737 is about 273.4301162654.

The spelling of 20442737 in words is "twenty million, four hundred forty-two thousand, seven hundred thirty-seven".