20747253 has 8 divisors (see below), whose sum is σ = 27694368. Its totient is φ = 13815824.

The previous prime is 20747239. The next prime is 20747263. The reversal of 20747253 is 35274702.

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 20747253 - 2¹⁴ = 20730869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20747253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747203) 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, 375 + ... + 6452.

It is an arithmetic number, because the mean of its divisors is an integer number (3461796).

Almost surely, 2^20747253 is an apocalyptic number.

It is an amenable number.

20747253 is a deficient number, since it is larger than the sum of its proper divisors (6947115).

20747253 is a wasteful number, since it uses less digits than its factorization.

20747253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7843.

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 20747253 is about 4554.9152571700. The cubic root of 20747253 is about 274.7811062526.

The spelling of 20747253 in words is "twenty million, seven hundred forty-seven thousand, two hundred fifty-three".