20239801 has 4 divisors (see below), whose sum is σ = 20250000. Its totient is φ = 20229604.

The previous prime is 20239787. The next prime is 20239811. The reversal of 20239801 is 10893202.

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.

It is a cyclic number.

It is not a de Polignac number, because 20239801 - 2¹⁷ = 20108729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20239811) 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, 1051 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (5062500).

Almost surely, 2^20239801 is an apocalyptic number.

It is an amenable number.

20239801 is a deficient number, since it is larger than the sum of its proper divisors (10199).

20239801 is an equidigital number, since it uses as much as digits as its factorization.

20239801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10198.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20239801 is about 4498.8666350538. The cubic root of 20239801 is about 272.5223212083.

The spelling of 20239801 in words is "twenty million, two hundred thirty-nine thousand, eight hundred one".