20151001 has 16 divisors (see below), whose sum is σ = 24192000. Its totient is φ = 16581888.

The previous prime is 20150983. The next prime is 20151011. The reversal of 20151001 is 10015102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20151001 - 2⁷ = 20150873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20151011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800 + ... + 6598.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^20151001 is an apocalyptic number.

It is an amenable number.

20151001 is a deficient number, since it is larger than the sum of its proper divisors (4040999).

20151001 is a wasteful number, since it uses less digits than its factorization.

20151001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4848.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 20151001 is about 4488.9866339743. The cubic root of 20151001 is about 272.1231825629.

Adding to 20151001 its reverse (10015102), we get a palindrome (30166103).

The spelling of 20151001 in words is "twenty million, one hundred fifty-one thousand, one".