20150001 has 24 divisors (see below), whose sum is σ = 30566016. Its totient is φ = 12767040.

The previous prime is 20149973. The next prime is 20150021. The reversal of 20150001 is 10005102.

It is a happy number.

It is not a de Polignac number, because 20150001 - 2⁷ = 20149873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20150021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64221 + ... + 64533.

It is an arithmetic number, because the mean of its divisors is an integer number (1273584).

Almost surely, 2^20150001 is an apocalyptic number.

It is an amenable number.

20150001 is a deficient number, since it is larger than the sum of its proper divisors (10416015).

20150001 is a wasteful number, since it uses less digits than its factorization.

20150001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 20150001 is about 4488.8752488792. The cubic root of 20150001 is about 272.1186810878.

Adding to 20150001 its reverse (10005102), we get a palindrome (30155103).

The spelling of 20150001 in words is "twenty million, one hundred fifty thousand, one".