20940915 has 8 divisors (see below), whose sum is σ = 33505488. Its totient is φ = 11168480.

The previous prime is 20940901. The next prime is 20940967. The reversal of 20940915 is 51904902.

It is a happy number.

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

It is not a de Polignac number, because 20940915 - 2⁶ = 20940851 is a prime.

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, 698016 + ... + 698045.

It is an arithmetic number, because the mean of its divisors is an integer number (4188186).

Almost surely, 2^20940915 is an apocalyptic number.

20940915 is a deficient number, since it is larger than the sum of its proper divisors (12564573).

20940915 is a wasteful number, since it uses less digits than its factorization.

20940915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396069.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20940915 is about 4576.1244519790. The cubic root of 20940915 is about 275.6334269152.

The spelling of 20940915 in words is "twenty million, nine hundred forty thousand, nine hundred fifteen".