20781962 has 8 divisors (see below), whose sum is σ = 31481892. Its totient is φ = 10288000.

The previous prime is 20781931. The next prime is 20782031. The reversal of 20781962 is 26918702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15768841 + 5013121 = 3971^2 + 2239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 51239 + ... + 51642.

Almost surely, 2^20781962 is an apocalyptic number.

20781962 is a deficient number, since it is larger than the sum of its proper divisors (10699930).

20781962 is a wasteful number, since it uses less digits than its factorization.

20781962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102984.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20781962 is about 4558.7237249037. The cubic root of 20781962 is about 274.9342520506.

The spelling of 20781962 in words is "twenty million, seven hundred eighty-one thousand, nine hundred sixty-two".