20942949 has 16 divisors (see below), whose sum is σ = 30081024. Its totient is φ = 12922800.

The previous prime is 20942917. The next prime is 20942951. The reversal of 20942949 is 94924902.

It is not a de Polignac number, because 20942949 - 2⁵ = 20942917 is a prime.

It is a super-2 number, since 2×20942949² = 877214225633202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2757 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (1880064).

Almost surely, 2^20942949 is an apocalyptic number.

It is an amenable number.

20942949 is a deficient number, since it is larger than the sum of its proper divisors (9138075).

20942949 is a wasteful number, since it uses less digits than its factorization.

20942949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9848.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20942949 is about 4576.3466870420. The cubic root of 20942949 is about 275.6423507570.

The spelling of 20942949 in words is "twenty million, nine hundred forty-two thousand, nine hundred forty-nine".