20729764 has 24 divisors (see below), whose sum is σ = 40543776. Its totient is φ = 9192000.

The previous prime is 20729747. The next prime is 20729771. The reversal of 20729764 is 46792702.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 3942 + ... + 7549.

It is an arithmetic number, because the mean of its divisors is an integer number (1689324).

Almost surely, 2^20729764 is an apocalyptic number.

It is an amenable number.

20729764 is a deficient number, since it is larger than the sum of its proper divisors (19814012).

20729764 is a wasteful number, since it uses less digits than its factorization.

20729764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547 (or 11545 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20729764 is about 4552.9950582007. The cubic root of 20729764 is about 274.7038751815.

The spelling of 20729764 in words is "twenty million, seven hundred twenty-nine thousand, seven hundred sixty-four".