20729312 has 24 divisors (see below), whose sum is σ = 40919256. Its totient is φ = 10337152.

The previous prime is 20729281. The next prime is 20729329. The reversal of 20729312 is 21392702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17243 + ... + 18405.

It is an arithmetic number, because the mean of its divisors is an integer number (1704969).

Almost surely, 2^20729312 is an apocalyptic number.

It is an amenable number.

20729312 is a deficient number, since it is larger than the sum of its proper divisors (20189944).

20729312 is a wasteful number, since it uses less digits than its factorization.

20729312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20729312 is about 4552.9454202747. The cubic root of 20729312 is about 274.7018785828.

The spelling of 20729312 in words is "twenty million, seven hundred twenty-nine thousand, three hundred twelve".