20455537 has 2 divisors, whose sum is σ = 20455538. Its totient is φ = 20455536.

The previous prime is 20455531. The next prime is 20455541. The reversal of 20455537 is 73555402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20106256 + 349281 = 4484^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455537 - 2³ = 20455529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20455499 and 20455508.

It is not a weakly prime, because it can be changed into another prime (20455531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227768 + 10227769.

It is an arithmetic number, because the mean of its divisors is an integer number (10227769).

Almost surely, 2^20455537 is an apocalyptic number.

It is an amenable number.

20455537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455537 is an equidigital number, since it uses as much as digits as its factorization.

20455537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 20455537 is about 4522.7797868125. The cubic root of 20455537 is about 273.4871728012.

The spelling of 20455537 in words is "twenty million, four hundred fifty-five thousand, five hundred thirty-seven".