201020002031 has 4 divisors (see below), whose sum is σ = 204812832312. Its totient is φ = 197227171752.

The previous prime is 201020002021. The next prime is 201020002037. The reversal of 201020002031 is 130200020102.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201020002031 is a prime.

It is a super-2 number, since 2×201020002031² (a number of 23 digits) 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 (201020002037) 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, 1896415061 + ... + 1896415166.

It is an arithmetic number, because the mean of its divisors is an integer number (51203208078).

Almost surely, 2^201020002031 is an apocalyptic number.

201020002031 is a deficient number, since it is larger than the sum of its proper divisors (3792830281).

201020002031 is an equidigital number, since it uses as much as digits as its factorization.

201020002031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792830280.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 201020002031 its reverse (130200020102), we get a palindrome (331220022133).

The spelling of 201020002031 in words is "two hundred one billion, twenty million, two thousand, thirty-one".