20253845 has 4 divisors (see below), whose sum is σ = 24304620. Its totient is φ = 16203072.

The previous prime is 20253839. The next prime is 20253853. The reversal of 20253845 is 54835202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9449476 + 10804369 = 3074^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 20253845 - 2⁸ = 20253589 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2025380 + ... + 2025389.

It is an arithmetic number, because the mean of its divisors is an integer number (6076155).

Almost surely, 2^20253845 is an apocalyptic number.

It is an amenable number.

20253845 is a deficient number, since it is larger than the sum of its proper divisors (4050775).

20253845 is an equidigital number, since it uses as much as digits as its factorization.

20253845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050774.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20253845 is about 4500.4272019443. The cubic root of 20253845 is about 272.5853392619.

The spelling of 20253845 in words is "twenty million, two hundred fifty-three thousand, eight hundred forty-five".