20729964 has 24 divisors (see below), whose sum is σ = 48742848. Its totient is φ = 6856720.

The previous prime is 20729939. The next prime is 20729981. The reversal of 20729964 is 46992702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5022 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (2030952).

Almost surely, 2^20729964 is an apocalyptic number.

It is an amenable number.

20729964 is an abundant number, since it is smaller than the sum of its proper divisors (28012884).

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

20729964 is a wasteful number, since it uses less digits than its factorization.

20729964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13325 (or 13323 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 20729964 is about 4553.0170217121. The cubic root of 20729964 is about 274.7047586229.

The spelling of 20729964 in words is "twenty million, seven hundred twenty-nine thousand, nine hundred sixty-four".