20038813 has 4 divisors (see below), whose sum is σ = 20047968. Its totient is φ = 20029660.

The previous prime is 20038789. The next prime is 20038841. The reversal of 20038813 is 31883002.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31883002 = 2 ⋅15941501.

It is a cyclic number.

It is not a de Polignac number, because 20038813 - 2²¹ = 17941661 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 (20038883) 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, 858 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (5011992).

Almost surely, 2^20038813 is an apocalyptic number.

It is an amenable number.

20038813 is a deficient number, since it is larger than the sum of its proper divisors (9155).

20038813 is an equidigital number, since it uses as much as digits as its factorization.

20038813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9154.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20038813 is about 4476.4732770341. The cubic root of 20038813 is about 271.6172393464.

It can be divided in two parts, 2003 and 8813, that added together give a square (10816 = 104²).

The spelling of 20038813 in words is "twenty million, thirty-eight thousand, eight hundred thirteen".