20642253 has 8 divisors (see below), whose sum is σ = 27626400. Its totient is φ = 13709808.

The previous prime is 20642239. The next prime is 20642257. The reversal of 20642253 is 35224602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20642253 is a prime.

It is a super-2 number, since 2×20642253² = 852205217832018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11983 + ... + 13596.

It is an arithmetic number, because the mean of its divisors is an integer number (3453300).

Almost surely, 2^20642253 is an apocalyptic number.

It is an amenable number.

20642253 is a deficient number, since it is larger than the sum of its proper divisors (6984147).

20642253 is a wasteful number, since it uses less digits than its factorization.

20642253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25851.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20642253 is about 4543.3746268605. The cubic root of 20642253 is about 274.3167744851.

Adding to 20642253 its reverse (35224602), we get a palindrome (55866855).

The spelling of 20642253 in words is "twenty million, six hundred forty-two thousand, two hundred fifty-three".