20152001 has 4 divisors (see below), whose sum is σ = 20435904. Its totient is φ = 19868100.

The previous prime is 20151991. The next prime is 20152019. The reversal of 20152001 is 10025102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20152001 is a prime.

It is a super-2 number, since 2×20152001² = 812206288608002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20152051) 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, 141845 + ... + 141986.

It is an arithmetic number, because the mean of its divisors is an integer number (5108976).

Almost surely, 2^20152001 is an apocalyptic number.

It is an amenable number.

20152001 is a deficient number, since it is larger than the sum of its proper divisors (283903).

20152001 is an equidigital number, since it uses as much as digits as its factorization.

20152001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283902.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20152001 is about 4489.0980163057. The cubic root of 20152001 is about 272.1276838890.

Adding to 20152001 its reverse (10025102), we get a palindrome (30177103).

The spelling of 20152001 in words is "twenty million, one hundred fifty-two thousand, one".