20199729 has 8 divisors (see below), whose sum is σ = 29381472. Its totient is φ = 12242240.

The previous prime is 20199709. The next prime is 20199737. The reversal of 20199729 is 92799102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20199729 - 2¹³ = 20191537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20199709) by changing a digit.

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, 306024 + ... + 306089.

It is an arithmetic number, because the mean of its divisors is an integer number (3672684).

Almost surely, 2^20199729 is an apocalyptic number.

It is an amenable number.

20199729 is a deficient number, since it is larger than the sum of its proper divisors (9181743).

20199729 is a wasteful number, since it uses less digits than its factorization.

20199729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612127.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 20199729 is about 4494.4108623934. The cubic root of 20199729 is about 272.3423502454.

The spelling of 20199729 in words is "twenty million, one hundred ninety-nine thousand, seven hundred twenty-nine".