20201993 has 8 divisors (see below), whose sum is σ = 23157312. Its totient is φ = 17264016.

The previous prime is 20201983. The next prime is 20202011. The reversal of 20201993 is 39910202.

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

It is not a de Polignac number, because 20201993 - 2¹² = 20197897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201983) 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, 1730 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (2894664).

Almost surely, 2^20201993 is an apocalyptic number.

It is an amenable number.

20201993 is a deficient number, since it is larger than the sum of its proper divisors (2955319).

20201993 is an equidigital number, since it uses as much as digits as its factorization.

20201993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8671.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20201993 is about 4494.6627237202. The cubic root of 20201993 is about 272.3525246401.

It can be divided in two parts, 2020199 and 3, that added together give a palindrome (2020202).

The spelling of 20201993 in words is "twenty million, two hundred one thousand, nine hundred ninety-three".