20457906 has 16 divisors (see below), whose sum is σ = 46761024. Its totient is φ = 5845104.

The previous prime is 20457901. The next prime is 20457911. The reversal of 20457906 is 60975402.

It is an interprime number because it is at equal distance from previous prime (20457901) and next prime (20457911).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20457901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243505 + ... + 243588.

It is an arithmetic number, because the mean of its divisors is an integer number (2922564).

Almost surely, 2^20457906 is an apocalyptic number.

20457906 is an abundant number, since it is smaller than the sum of its proper divisors (26303118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20457906 is a wasteful number, since it uses less digits than its factorization.

20457906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487105.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20457906 is about 4523.0416756868. The cubic root of 20457906 is about 273.4977301074.

The spelling of 20457906 in words is "twenty million, four hundred fifty-seven thousand, nine hundred six".