20475007 has 4 divisors (see below), whose sum is σ = 23400016. Its totient is φ = 17550000.

The previous prime is 20475001. The next prime is 20475019. The reversal of 20475007 is 70057402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20475007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475001) 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, 1462494 + ... + 1462507.

It is an arithmetic number, because the mean of its divisors is an integer number (5850004).

Almost surely, 2^20475007 is an apocalyptic number.

20475007 is a deficient number, since it is larger than the sum of its proper divisors (2925009).

20475007 is an equidigital number, since it uses as much as digits as its factorization.

20475007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925008.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20475007 is about 4524.9317121919. The cubic root of 20475007 is about 273.5739155208.

The spelling of 20475007 in words is "twenty million, four hundred seventy-five thousand, seven".