20442667 has 4 divisors (see below), whose sum is σ = 23363056. Its totient is φ = 17522280.

The previous prime is 20442661. The next prime is 20442691. The reversal of 20442667 is 76624402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76624402 = 2 ⋅38312201.

It is a cyclic number.

It is not a de Polignac number, because 20442667 - 2³ = 20442659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442661) 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, 1460184 + ... + 1460197.

It is an arithmetic number, because the mean of its divisors is an integer number (5840764).

Almost surely, 2^20442667 is an apocalyptic number.

20442667 is a deficient number, since it is larger than the sum of its proper divisors (2920389).

20442667 is an equidigital number, since it uses as much as digits as its factorization.

20442667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920388.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20442667 is about 4521.3567653969. The cubic root of 20442667 is about 273.4298041720.

The spelling of 20442667 in words is "twenty million, four hundred forty-two thousand, six hundred sixty-seven".