20155215 has 8 divisors (see below), whose sum is σ = 32248368. Its totient is φ = 10749440.

The previous prime is 20155169. The next prime is 20155249. The reversal of 20155215 is 51255102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20155215 - 2⁹ = 20154703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20155191 and 20155200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671826 + ... + 671855.

It is an arithmetic number, because the mean of its divisors is an integer number (4031046).

Almost surely, 2^20155215 is an apocalyptic number.

20155215 is a deficient number, since it is larger than the sum of its proper divisors (12093153).

20155215 is a wasteful number, since it uses less digits than its factorization.

20155215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343689.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 20155215 is about 4489.4559804056. The cubic root of 20155215 is about 272.1421501428.

The spelling of 20155215 in words is "twenty million, one hundred fifty-five thousand, two hundred fifteen".