20445953 has 8 divisors (see below), whose sum is σ = 22448640. Its totient is φ = 18467280.

The previous prime is 20445949. The next prime is 20445961. The reversal of 20445953 is 35954402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20445953 - 2² = 20445949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4193 + ... + 7646.

It is an arithmetic number, because the mean of its divisors is an integer number (2806080).

Almost surely, 2^20445953 is an apocalyptic number.

It is an amenable number.

20445953 is a deficient number, since it is larger than the sum of its proper divisors (2002687).

20445953 is a wasteful number, since it uses less digits than its factorization.

20445953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12007.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20445953 is about 4521.7201372929. The cubic root of 20445953 is about 273.4444539597. Note that the first 4 decimals are identical.

It can be divided in two parts, 2044 and 5953, that added together give a palindrome (7997).

The spelling of 20445953 in words is "twenty million, four hundred forty-five thousand, nine hundred fifty-three".