20729019 has 16 divisors (see below), whose sum is σ = 29203200. Its totient is φ = 13042656.

The previous prime is 20729017. The next prime is 20729041. The reversal of 20729019 is 91092702.

It is not a de Polignac number, because 20729019 - 2¹ = 20729017 is a prime.

It is a super-2 number, since 2×20729019² = 859384457404722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20729011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19957 + ... + 20969.

It is an arithmetic number, because the mean of its divisors is an integer number (1825200).

Almost surely, 2^20729019 is an apocalyptic number.

20729019 is a deficient number, since it is larger than the sum of its proper divisors (8474181).

20729019 is a wasteful number, since it uses less digits than its factorization.

20729019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20729019 is about 4552.9132431884. The cubic root of 20729019 is about 274.7005843120.

The spelling of 20729019 in words is "twenty million, seven hundred twenty-nine thousand, nineteen".