20731770 has 24 divisors (see below), whose sum is σ = 53902836. Its totient is φ = 5528448.

The previous prime is 20731769. The next prime is 20731783. The reversal of 20731770 is 7713702.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 400689 = 4509^2 + 633^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115087 + ... + 115266.

Almost surely, 2^20731770 is an apocalyptic number.

20731770 is an abundant number, since it is smaller than the sum of its proper divisors (33171066).

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

20731770 is a wasteful number, since it uses less digits than its factorization.

20731770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230366 (or 230363 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 20731770 is about 4553.2153474221. The cubic root of 20731770 is about 274.7127358419.

The spelling of 20731770 in words is "twenty million, seven hundred thirty-one thousand, seven hundred seventy".