20306253 has 8 divisors (see below), whose sum is σ = 29536416. Its totient is φ = 12306800.

The previous prime is 20306243. The next prime is 20306257. The reversal of 20306253 is 35260302.

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

It is not a de Polignac number, because 20306253 - 2¹² = 20302157 is a prime.

It is a super-3 number, since 3×20306253³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306257) 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, 307638 + ... + 307703.

It is an arithmetic number, because the mean of its divisors is an integer number (3692052).

Almost surely, 2^20306253 is an apocalyptic number.

It is an amenable number.

20306253 is a deficient number, since it is larger than the sum of its proper divisors (9230163).

20306253 is a wasteful number, since it uses less digits than its factorization.

20306253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615355.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20306253 is about 4506.2459986113. The cubic root of 20306253 is about 272.8202468970.

Adding to 20306253 its reverse (35260302), we get a palindrome (55566555).

The spelling of 20306253 in words is "twenty million, three hundred six thousand, two hundred fifty-three".