20653239 has 8 divisors (see below), whose sum is σ = 27581040. Its totient is φ = 13747136.

The previous prime is 20653229. The next prime is 20653267. The reversal of 20653239 is 93235602.

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

It is a cyclic number.

It is not a de Polignac number, because 20653239 - 2¹³ = 20645047 is a prime.

It is a super-2 number, since 2×20653239² = 853112562382242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20653229) 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, 3054 + ... + 7115.

It is an arithmetic number, because the mean of its divisors is an integer number (3447630).

Almost surely, 2^20653239 is an apocalyptic number.

20653239 is a deficient number, since it is larger than the sum of its proper divisors (6927801).

20653239 is a wasteful number, since it uses less digits than its factorization.

20653239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10849.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 20653239 is about 4544.5834792641. The cubic root of 20653239 is about 274.3654305050.

The spelling of 20653239 in words is "twenty million, six hundred fifty-three thousand, two hundred thirty-nine".