20691942 has 32 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 6545760.

The previous prime is 20691929. The next prime is 20691959. The reversal of 20691942 is 24919602.

It is a congruent number.

It is an unprimeable number.

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, 8809 + ... + 10907.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^20691942 is an apocalyptic number.

20691942 is an abundant number, since it is smaller than the sum of its proper divisors (22853658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20691942 is a wasteful number, since it uses less digits than its factorization.

20691942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20691942 is about 4548.8396322579. The cubic root of 20691942 is about 274.5367053215.

The spelling of 20691942 in words is "twenty million, six hundred ninety-one thousand, nine hundred forty-two".