20729498 has 4 divisors (see below), whose sum is σ = 31094250. Its totient is φ = 10364748.

The previous prime is 20729479. The next prime is 20729503. The reversal of 20729498 is 89492702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 54289 = 4547^2 + 233^2 .

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, 5182373 + ... + 5182376.

Almost surely, 2^20729498 is an apocalyptic number.

20729498 is a deficient number, since it is larger than the sum of its proper divisors (10364752).

20729498 is a wasteful number, since it uses less digits than its factorization.

20729498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10364751.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20729498 is about 4552.9658465664. The cubic root of 20729498 is about 274.7027001955.

The spelling of 20729498 in words is "twenty million, seven hundred twenty-nine thousand, four hundred ninety-eight".