20830978 has 12 divisors (see below), whose sum is σ = 36348102. Its totient is φ = 8927520.

The previous prime is 20830949. The next prime is 20830991. The reversal of 20830978 is 87903802.

It can be written as a sum of positive squares in only one way, i.e., 11812969 + 9018009 = 3437^2 + 3003^2 .

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 106183 + ... + 106378.

Almost surely, 2^20830978 is an apocalyptic number.

20830978 is a deficient number, since it is larger than the sum of its proper divisors (15517124).

20830978 is a wasteful number, since it uses less digits than its factorization.

20830978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212577 (or 212570 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20830978 is about 4564.0966247440. The cubic root of 20830978 is about 275.1502341647.

The spelling of 20830978 in words is "twenty million, eight hundred thirty thousand, nine hundred seventy-eight".