20340945 has 24 divisors (see below), whose sum is σ = 35433216. Its totient is φ = 10794528.

The previous prime is 20340937. The next prime is 20341007. The reversal of 20340945 is 54904302.

It is not a de Polignac number, because 20340945 - 2³ = 20340937 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9022 + ... + 11048.

It is an arithmetic number, because the mean of its divisors is an integer number (1476384).

Almost surely, 2^20340945 is an apocalyptic number.

It is an amenable number.

20340945 is a deficient number, since it is larger than the sum of its proper divisors (15092271).

20340945 is a wasteful number, since it uses less digits than its factorization.

20340945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261 (or 2258 counting only the distinct ones).

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

The square root of 20340945 is about 4510.0936797366. The cubic root of 20340945 is about 272.9755241109.

The spelling of 20340945 in words is "twenty million, three hundred forty thousand, nine hundred forty-five".