20997053 has 16 divisors (see below), whose sum is σ = 26282880. Its totient is φ = 16296000.

The previous prime is 20997047. The next prime is 20997059. The reversal of 20997053 is 35079902.

It is an interprime number because it is at equal distance from previous prime (20997047) and next prime (20997059).

It is a de Polignac number, because none of the positive numbers 2^k-20997053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29603 + ... + 30303.

It is an arithmetic number, because the mean of its divisors is an integer number (1642680).

Almost surely, 2^20997053 is an apocalyptic number.

It is an amenable number.

20997053 is a deficient number, since it is larger than the sum of its proper divisors (5285827).

20997053 is a wasteful number, since it uses less digits than its factorization.

20997053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20997053 is about 4582.2541396129. The cubic root of 20997053 is about 275.8795114002.

The spelling of 20997053 in words is "twenty million, nine hundred ninety-seven thousand, fifty-three".