20553619 has 2 divisors, whose sum is σ = 20553620. Its totient is φ = 20553618.

The previous prime is 20553607. The next prime is 20553623. The reversal of 20553619 is 91635502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20553619 - 2⁹ = 20553107 is a prime.

It is a super-2 number, since 2×20553619² = 844902507994322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20556619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276809 + 10276810.

It is an arithmetic number, because the mean of its divisors is an integer number (10276810).

Almost surely, 2^20553619 is an apocalyptic number.

20553619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553619 is an equidigital number, since it uses as much as digits as its factorization.

20553619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20553619 is about 4533.6099302873. The cubic root of 20553619 is about 273.9235894344.

It can be divided in two parts, 205 and 53619, that added together give a square (53824 = 232²).

The spelling of 20553619 in words is "twenty million, five hundred fifty-three thousand, six hundred nineteen".