20553503 has 2 divisors, whose sum is σ = 20553504. Its totient is φ = 20553502.

The previous prime is 20553499. The next prime is 20553517. The reversal of 20553503 is 30535502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20553503 - 2² = 20553499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276751 + 10276752.

It is an arithmetic number, because the mean of its divisors is an integer number (10276752).

Almost surely, 2^20553503 is an apocalyptic number.

20553503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553503 is an equidigital number, since it uses as much as digits as its factorization.

20553503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20553503 is about 4533.5971369322. The cubic root of 20553503 is about 273.9230741124.

The spelling of 20553503 in words is "twenty million, five hundred fifty-three thousand, five hundred three".