20245907 has 4 divisors (see below), whose sum is σ = 22086456. Its totient is φ = 18405360.

The previous prime is 20245891. The next prime is 20245931. The reversal of 20245907 is 70954202.

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

It is a cyclic number.

It is not a de Polignac number, because 20245907 - 2⁴ = 20245891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20245907.

It is not an unprimeable number, because it can be changed into a prime (20245007) 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, 920258 + ... + 920279.

It is an arithmetic number, because the mean of its divisors is an integer number (5521614).

Almost surely, 2^20245907 is an apocalyptic number.

20245907 is a deficient number, since it is larger than the sum of its proper divisors (1840549).

20245907 is a wasteful number, since it uses less digits than its factorization.

20245907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840548.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20245907 is about 4499.5451992396. The cubic root of 20245907 is about 272.5497235526.

The spelling of 20245907 in words is "twenty million, two hundred forty-five thousand, nine hundred seven".