20238899 has 4 divisors (see below), whose sum is σ = 20263320. Its totient is φ = 20214480.

The previous prime is 20238887. The next prime is 20238901. The reversal of 20238899 is 99883202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20238899 - 2¹² = 20234803 is a prime.

It is a super-2 number, since 2×20238899² = 819226065464402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20238809) 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, 10922 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (5065830).

Almost surely, 2^20238899 is an apocalyptic number.

20238899 is a deficient number, since it is larger than the sum of its proper divisors (24421).

20238899 is an equidigital number, since it uses as much as digits as its factorization.

20238899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24420.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20238899 is about 4498.7663864664. The cubic root of 20238899 is about 272.5182727696.

The spelling of 20238899 in words is "twenty million, two hundred thirty-eight thousand, eight hundred ninety-nine".