20402253 has 16 divisors (see below), whose sum is σ = 30930240. Its totient is φ = 13284432.

The previous prime is 20402251. The next prime is 20402267. The reversal of 20402253 is 35220402.

It is not a de Polignac number, because 20402253 - 2¹ = 20402251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7626 + ... + 9947.

It is an arithmetic number, because the mean of its divisors is an integer number (1933140).

Almost surely, 2^20402253 is an apocalyptic number.

It is an amenable number.

20402253 is a deficient number, since it is larger than the sum of its proper divisors (10527987).

20402253 is a wasteful number, since it uses less digits than its factorization.

20402253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17625 (or 17619 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20402253 is about 4516.8853206607. The cubic root of 20402253 is about 273.2495002010.

Adding to 20402253 its reverse (35220402), we get a palindrome (55622655).

The spelling of 20402253 in words is "twenty million, four hundred two thousand, two hundred fifty-three".