20190215 has 4 divisors (see below), whose sum is σ = 24228264. Its totient is φ = 16152168.

The previous prime is 20190187. The next prime is 20190221. The reversal of 20190215 is 51209102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20190215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019017 + ... + 2019026.

It is an arithmetic number, because the mean of its divisors is an integer number (6057066).

Almost surely, 2^20190215 is an apocalyptic number.

20190215 is a deficient number, since it is larger than the sum of its proper divisors (4038049).

20190215 is an equidigital number, since it uses as much as digits as its factorization.

20190215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038048.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 20190215 is about 4493.3523120272. The cubic root of 20190215 is about 272.2995861070.

Adding to 20190215 its reverse (51209102), we get a palindrome (71399317).

The spelling of 20190215 in words is "twenty million, one hundred ninety thousand, two hundred fifteen".