20453971 has 8 divisors (see below), whose sum is σ = 20861264. Its totient is φ = 20049120.

The previous prime is 20453921. The next prime is 20453987. The reversal of 20453971 is 17935402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20453971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20453921) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 33061 + ... + 33673.

It is an arithmetic number, because the mean of its divisors is an integer number (2607658).

Almost surely, 2^20453971 is an apocalyptic number.

20453971 is a deficient number, since it is larger than the sum of its proper divisors (407293).

20453971 is an equidigital number, since it uses as much as digits as its factorization.

20453971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20453971 is about 4522.6066598810. The cubic root of 20453971 is about 273.4801935687.

Subtracting from 20453971 its reverse (17935402), we obtain a square (2518569 = 1587²).

The spelling of 20453971 in words is "twenty million, four hundred fifty-three thousand, nine hundred seventy-one".