20215453 has 4 divisors (see below), whose sum is σ = 20415708. Its totient is φ = 20015200.

The previous prime is 20215451. The next prime is 20215457. The reversal of 20215453 is 35451202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 4549689 = 3958^2 + 2133^2 .

It is a cyclic number.

It is not a de Polignac number, because 20215453 - 2¹ = 20215451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215451) 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, 99976 + ... + 100177.

It is an arithmetic number, because the mean of its divisors is an integer number (5103927).

Almost surely, 2^20215453 is an apocalyptic number.

It is an amenable number.

20215453 is a deficient number, since it is larger than the sum of its proper divisors (200255).

20215453 is a wasteful number, since it uses less digits than its factorization.

20215453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200254.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20215453 is about 4496.1598058788. The cubic root of 20215453 is about 272.4129980651.

Adding to 20215453 its reverse (35451202), we get a palindrome (55666655).

The spelling of 20215453 in words is "twenty million, two hundred fifteen thousand, four hundred fifty-three".