20700253 has 32 divisors (see below), whose sum is σ = 26634240. Its totient is φ = 15681600.

The previous prime is 20700233. The next prime is 20700269. The reversal of 20700253 is 35200702.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20700253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20700253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204903 + ... + 205003.

It is an arithmetic number, because the mean of its divisors is an integer number (832320).

Almost surely, 2^20700253 is an apocalyptic number.

20700253 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20700253 is a deficient number, since it is larger than the sum of its proper divisors (5933987).

20700253 is a wasteful number, since it uses less digits than its factorization.

20700253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20700253 is about 4549.7530702226. The cubic root of 20700253 is about 274.5734566512.

Adding to 20700253 its reverse (35200702), we get a palindrome (55900955).

The spelling of 20700253 in words is "twenty million, seven hundred thousand, two hundred fifty-three".