20449237 has 4 divisors (see below), whose sum is σ = 20459980. Its totient is φ = 20438496.

The previous prime is 20449211. The next prime is 20449241. The reversal of 20449237 is 73294402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17230801 + 3218436 = 4151^2 + 1794^2 .

It is a cyclic number.

It is not a de Polignac number, because 20449237 - 2⁷ = 20449109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20449199 and 20449208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (5114995).

Almost surely, 2^20449237 is an apocalyptic number.

It is an amenable number.

20449237 is a deficient number, since it is larger than the sum of its proper divisors (10743).

20449237 is an equidigital number, since it uses as much as digits as its factorization.

20449237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20449237 is about 4522.0832588532. The cubic root of 20449237 is about 273.4590932629.

The spelling of 20449237 in words is "twenty million, four hundred forty-nine thousand, two hundred thirty-seven".