20775215 has 8 divisors (see below), whose sum is σ = 25007568. Its totient is φ = 16568640.

The previous prime is 20775211. The next prime is 20775217. The reversal of 20775215 is 51257702.

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

It is not a de Polignac number, because 20775215 - 2² = 20775211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4622 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (3125946).

Almost surely, 2^20775215 is an apocalyptic number.

20775215 is a deficient number, since it is larger than the sum of its proper divisors (4232353).

20775215 is a wasteful number, since it uses less digits than its factorization.

20775215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12889.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 20775215 is about 4557.9836550826. The cubic root of 20775215 is about 274.9044957620.

The spelling of 20775215 in words is "twenty million, seven hundred seventy-five thousand, two hundred fifteen".