20238981 has 8 divisors (see below), whose sum is σ = 30840384. Its totient is φ = 11565120.

The previous prime is 20238973. The next prime is 20238989. The reversal of 20238981 is 18983202.

It is an interprime number because it is at equal distance from previous prime (20238973) and next prime (20238989).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20238981 - 2³ = 20238973 is a prime.

It is a super-2 number, since 2×20238981² = 819232703836722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20238989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481860 + ... + 481901.

It is an arithmetic number, because the mean of its divisors is an integer number (3855048).

Almost surely, 2^20238981 is an apocalyptic number.

20238981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20238981 is a deficient number, since it is larger than the sum of its proper divisors (10601403).

20238981 is an equidigital number, since it uses as much as digits as its factorization.

20238981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963771.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 20238981 is about 4498.7755000667. The cubic root of 20238981 is about 272.5186408144.

The spelling of 20238981 in words is "twenty million, two hundred thirty-eight thousand, nine hundred eighty-one".