20850413 has 4 divisors (see below), whose sum is σ = 20872608. Its totient is φ = 20828220.

The previous prime is 20850409. The next prime is 20850437. The reversal of 20850413 is 31405802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31405802 = 2 ⋅15702901.

It is a cyclic number.

It is not a de Polignac number, because 20850413 - 2² = 20850409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850463) 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, 9623 + ... + 11588.

It is an arithmetic number, because the mean of its divisors is an integer number (5218152).

Almost surely, 2^20850413 is an apocalyptic number.

It is an amenable number.

20850413 is a deficient number, since it is larger than the sum of its proper divisors (22195).

20850413 is an equidigital number, since it uses as much as digits as its factorization.

20850413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22194.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20850413 is about 4566.2252463057. The cubic root of 20850413 is about 275.2357779575.

The spelling of 20850413 in words is "twenty million, eight hundred fifty thousand, four hundred thirteen".