20771738 has 16 divisors (see below), whose sum is σ = 33646536. Its totient is φ = 9560640.

The previous prime is 20771713. The next prime is 20771747. The reversal of 20771738 is 83717702.

It can be written as a sum of positive squares in 4 ways, for example, as 11992369 + 8779369 = 3463^2 + 2963^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20771698 and 20771707.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11120 + ... + 12852.

Almost surely, 2^20771738 is an apocalyptic number.

20771738 is a deficient number, since it is larger than the sum of its proper divisors (12874798).

20771738 is a wasteful number, since it uses less digits than its factorization.

20771738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 20771738 is about 4557.6022204664. The cubic root of 20771738 is about 274.8891586361.

The spelling of 20771738 in words is "twenty million, seven hundred seventy-one thousand, seven hundred thirty-eight".