20722253 has 8 divisors (see below), whose sum is σ = 21434880. Its totient is φ = 20021040.

The previous prime is 20722237. The next prime is 20722277. The reversal of 20722253 is 35222702.

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 20722253 - 2⁴ = 20722237 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 (20722283) 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, 923 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (2679360).

Almost surely, 2^20722253 is an apocalyptic number.

It is an amenable number.

20722253 is a deficient number, since it is larger than the sum of its proper divisors (712627).

20722253 is an equidigital number, since it uses as much as digits as its factorization.

20722253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5707.

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

The square root of 20722253 is about 4552.1701418115. The cubic root of 20722253 is about 274.6706934232.

Adding to 20722253 its reverse (35222702), we get a palindrome (55944955).

The spelling of 20722253 in words is "twenty million, seven hundred twenty-two thousand, two hundred fifty-three".