20031081 has 8 divisors (see below), whose sum is σ = 30523584. Its totient is φ = 11446320.

The previous prime is 20031059. The next prime is 20031101. The reversal of 20031081 is 18013002.

It is a happy number.

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

It is not a de Polignac number, because 20031081 - 2¹⁰ = 20030057 is a prime.

It is a super-2 number, since 2×20031081² = 802488412057122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20031081.

It is not an unprimeable number, because it can be changed into a prime (20031041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476910 + ... + 476951.

It is an arithmetic number, because the mean of its divisors is an integer number (3815448).

Almost surely, 2^20031081 is an apocalyptic number.

20031081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20031081 is a deficient number, since it is larger than the sum of its proper divisors (10492503).

20031081 is an equidigital number, since it uses as much as digits as its factorization.

20031081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953871.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20031081 is about 4475.6095674221. The cubic root of 20031081 is about 271.5823002399.

Adding to 20031081 its reverse (18013002), we get a palindrome (38044083).

The spelling of 20031081 in words is "twenty million, thirty-one thousand, eighty-one".