20249953 has 4 divisors (see below), whose sum is σ = 21315760. Its totient is φ = 19184148.

The previous prime is 20249893. The next prime is 20249963. The reversal of 20249953 is 35994202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20249953 - 2⁹ = 20249441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20249963) 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, 532875 + ... + 532912.

It is an arithmetic number, because the mean of its divisors is an integer number (5328940).

Almost surely, 2^20249953 is an apocalyptic number.

It is an amenable number.

20249953 is a deficient number, since it is larger than the sum of its proper divisors (1065807).

20249953 is a wasteful number, since it uses less digits than its factorization.

20249953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065806.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20249953 is about 4499.9947777747. The cubic root of 20249953 is about 272.5678780489.

The spelling of 20249953 in words is "twenty million, two hundred forty-nine thousand, nine hundred fifty-three".