20940345 has 48 divisors (see below), whose sum is σ = 39716352. Its totient is φ = 10160640.

The previous prime is 20940343. The next prime is 20940347. The reversal of 20940345 is 54304902.

It is an interprime number because it is at equal distance from previous prime (20940343) and next prime (20940347).

It is not a de Polignac number, because 20940345 - 2¹ = 20940343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20940341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23274 + ... + 24156.

It is an arithmetic number, because the mean of its divisors is an integer number (827424).

Almost surely, 2^20940345 is an apocalyptic number.

It is an amenable number.

20940345 is a deficient number, since it is larger than the sum of its proper divisors (18776007).

20940345 is a wasteful number, since it uses less digits than its factorization.

20940345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20940345 is about 4576.0621717804. The cubic root of 20940345 is about 275.6309260299.

The spelling of 20940345 in words is "twenty million, nine hundred forty thousand, three hundred forty-five".