20453437 has 2 divisors, whose sum is σ = 20453438. Its totient is φ = 20453436.

The previous prime is 20453401. The next prime is 20453453. The reversal of 20453437 is 73435402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 3896676 = 4069^2 + 1974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20453437 is a prime.

It is a super-2 number, since 2×20453437² = 836686170225938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226718 + 10226719.

It is an arithmetic number, because the mean of its divisors is an integer number (10226719).

Almost surely, 2^20453437 is an apocalyptic number.

It is an amenable number.

20453437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20453437 is an equidigital number, since it uses as much as digits as its factorization.

20453437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 20453437 is about 4522.5476227454. The cubic root of 20453437 is about 273.4778135958.

Adding to 20453437 its reverse (73435402), we get a palindrome (93888839).

The spelling of 20453437 in words is "twenty million, four hundred fifty-three thousand, four hundred thirty-seven".