20940215 has 4 divisors (see below), whose sum is σ = 25128264. Its totient is φ = 16752168.

The previous prime is 20940203. The next prime is 20940251. The reversal of 20940215 is 51204902.

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

It is a cyclic number.

It is not a de Polignac number, because 20940215 - 2²⁰ = 19891639 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, 2094017 + ... + 2094026.

It is an arithmetic number, because the mean of its divisors is an integer number (6282066).

Almost surely, 2^20940215 is an apocalyptic number.

20940215 is a deficient number, since it is larger than the sum of its proper divisors (4188049).

20940215 is an equidigital number, since it uses as much as digits as its factorization.

20940215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188048.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20940215 is about 4576.0479674059. The cubic root of 20940215 is about 275.6303556462.

The spelling of 20940215 in words is "twenty million, nine hundred forty thousand, two hundred fifteen".