20413537 has 2 divisors, whose sum is σ = 20413538. Its totient is φ = 20413536.

The previous prime is 20413511. The next prime is 20413559. The reversal of 20413537 is 73531402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 6155361 = 3776^2 + 2481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413537 - 2⁷ = 20413409 is a prime.

It is equal to p_1295134 and since 20413537 and 1295134 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20413597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206768 + 10206769.

It is an arithmetic number, because the mean of its divisors is an integer number (10206769).

Almost surely, 2^20413537 is an apocalyptic number.

It is an amenable number.

20413537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413537 is an equidigital number, since it uses as much as digits as its factorization.

20413537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20413537 is about 4518.1342388203. The cubic root of 20413537 is about 273.2998668458.

Adding to 20413537 its reverse (73531402), we get a palindrome (93944939).

The spelling of 20413537 in words is "twenty million, four hundred thirteen thousand, five hundred thirty-seven".