20702453 has 4 divisors (see below), whose sum is σ = 20760480. Its totient is φ = 20644428.

The previous prime is 20702449. The next prime is 20702459. The reversal of 20702453 is 35420702.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35420702 = 2 ⋅17710351.

It is a cyclic number.

It is not a de Polignac number, because 20702453 - 2² = 20702449 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 (20702459) 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, 28475 + ... + 29192.

It is an arithmetic number, because the mean of its divisors is an integer number (5190120).

Almost surely, 2^20702453 is an apocalyptic number.

It is an amenable number.

20702453 is a deficient number, since it is larger than the sum of its proper divisors (58027).

20702453 is an equidigital number, since it uses as much as digits as its factorization.

20702453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58026.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20702453 is about 4549.9948351619. The cubic root of 20702453 is about 274.5831834277.

The spelling of 20702453 in words is "twenty million, seven hundred two thousand, four hundred fifty-three".