20662253 has 4 divisors (see below), whose sum is σ = 21749760. Its totient is φ = 19574748.

The previous prime is 20662247. The next prime is 20662273. The reversal of 20662253 is 35226602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20662253 - 2¹⁴ = 20645869 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 (20662273) 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, 543725 + ... + 543762.

It is an arithmetic number, because the mean of its divisors is an integer number (5437440).

Almost surely, 2^20662253 is an apocalyptic number.

It is an amenable number.

20662253 is a deficient number, since it is larger than the sum of its proper divisors (1087507).

20662253 is a wasteful number, since it uses less digits than its factorization.

20662253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087506.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 20662253 is about 4545.5751011286. The cubic root of 20662253 is about 274.4053398267.

Adding to 20662253 its reverse (35226602), we get a palindrome (55888855).

The spelling of 20662253 in words is "twenty million, six hundred sixty-two thousand, two hundred fifty-three".