20946491 has 16 divisors (see below), whose sum is σ = 22560768. Its totient is φ = 19404000.

The previous prime is 20946487. The next prime is 20946503. The reversal of 20946491 is 19464902.

It is a cyclic number.

It is not a de Polignac number, because 20946491 - 2² = 20946487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20946451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164870 + ... + 164996.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^20946491 is an apocalyptic number.

20946491 is a deficient number, since it is larger than the sum of its proper divisors (1614277).

20946491 is a wasteful number, since it uses less digits than its factorization.

20946491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20946491 is about 4576.7336605925. The cubic root of 20946491 is about 275.6578893228.

The spelling of 20946491 in words is "twenty million, nine hundred forty-six thousand, four hundred ninety-one".