20032981 has 4 divisors (see below), whose sum is σ = 20073312. Its totient is φ = 19992652.

The previous prime is 20032967. The next prime is 20033009. The reversal of 20032981 is 18923002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20032981 - 2¹⁵ = 20000213 is a prime.

It is a super-2 number, since 2×20032981² = 802640655492722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032381) 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, 19411 + ... + 20416.

It is an arithmetic number, because the mean of its divisors is an integer number (5018328).

Almost surely, 2^20032981 is an apocalyptic number.

It is an amenable number.

20032981 is a deficient number, since it is larger than the sum of its proper divisors (40331).

20032981 is an equidigital number, since it uses as much as digits as its factorization.

20032981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40330.

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

The square root of 20032981 is about 4475.8218239783. The cubic root of 20032981 is about 271.5908867303.

Adding to 20032981 its reverse (18923002), we get a palindrome (38955983).

The spelling of 20032981 in words is "twenty million, thirty-two thousand, nine hundred eighty-one".