20656253 has 2 divisors, whose sum is σ = 20656254. Its totient is φ = 20656252.

The previous prime is 20656219. The next prime is 20656291. The reversal of 20656253 is 35265602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16826404 + 3829849 = 4102^2 + 1957^2 .

It is a cyclic number.

It is not a de Polignac number, because 20656253 - 2⁶ = 20656189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20656213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328126 + 10328127.

It is an arithmetic number, because the mean of its divisors is an integer number (10328127).

Almost surely, 2^20656253 is an apocalyptic number.

It is an amenable number.

20656253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20656253 is an equidigital number, since it uses as much as digits as its factorization.

20656253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 20656253 is about 4544.9150707136. The cubic root of 20656253 is about 274.3787762274.

The spelling of 20656253 in words is "twenty million, six hundred fifty-six thousand, two hundred fifty-three".