20729516 has 6 divisors (see below), whose sum is σ = 36276660. Its totient is φ = 10364756.

The previous prime is 20729503. The next prime is 20729531. The reversal of 20729516 is 61592702.

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 as a sum of consecutive naturals, namely, 2591186 + ... + 2591193.

It is an arithmetic number, because the mean of its divisors is an integer number (6046110).

Almost surely, 2^20729516 is an apocalyptic number.

It is an amenable number.

20729516 is a deficient number, since it is larger than the sum of its proper divisors (15547144).

20729516 is a wasteful number, since it uses less digits than its factorization.

20729516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182383 (or 5182381 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20729516 is about 4552.9678232994. The cubic root of 20729516 is about 274.7027797062.

The spelling of 20729516 in words is "twenty million, seven hundred twenty-nine thousand, five hundred sixteen".