20020001231 has 8 divisors (see below), whose sum is σ = 20456976384. Its totient is φ = 19583485240.

The previous prime is 20020001219. The next prime is 20020001237. The reversal of 20020001231 is 13210002002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020001231 is a prime.

It is a super-2 number, since 2×20020001231² (a number of 21 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 (20020001237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25895 + ... + 201768.

It is an arithmetic number, because the mean of its divisors is an integer number (2557122048).

Almost surely, 2^20020001231 is an apocalyptic number.

20020001231 is a deficient number, since it is larger than the sum of its proper divisors (436975153).

20020001231 is a wasteful number, since it uses less digits than its factorization.

20020001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229581.

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

Adding to 20020001231 its reverse (13210002002), we get a palindrome (33230003233).

The spelling of 20020001231 in words is "twenty billion, twenty million, one thousand, two hundred thirty-one".