20020001001 has 48 divisors (see below), whose sum is σ = 36480040128. Its totient is φ = 9599990400.

The previous prime is 20020000993. The next prime is 20020001039. The reversal of 20020001001 is 10010002002.

It is a happy number.

It is not a de Polignac number, because 20020001001 - 2³ = 20020000993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20020001081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 455170 + ... + 497211.

It is an arithmetic number, because the mean of its divisors is an integer number (760000836).

Almost surely, 2^20020001001 is an apocalyptic number.

20020001001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20020001001 is a deficient number, since it is larger than the sum of its proper divisors (16460039127).

20020001001 is a wasteful number, since it uses less digits than its factorization.

20020001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952422 (or 952415 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20020001001 its reverse (10010002002), we get a palindrome (30030003003).

It can be divided in two parts, 2002000 and 1001, that added together give a triangular number (2003001 = T₂₀₀₁).

The spelling of 20020001001 in words is "twenty billion, twenty million, one thousand, one".