20349999 has 6 divisors (see below), whose sum is σ = 29394456. Its totient is φ = 13566660.

The previous prime is 20349997. The next prime is 20350049. The reversal of 20349999 is 99994302.

It is not a de Polignac number, because 20349999 - 2¹ = 20349997 is a prime.

20349999 is a modest number, since divided by 9999 gives 2034 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20349997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130547 + ... + 1130564.

It is an arithmetic number, because the mean of its divisors is an integer number (4899076).

Almost surely, 2^20349999 is an apocalyptic number.

20349999 is a deficient number, since it is larger than the sum of its proper divisors (9044457).

20349999 is a wasteful number, since it uses less digits than its factorization.

20349999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261117 (or 2261114 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 20349999 is about 4511.0973166182. The cubic root of 20349999 is about 273.0160196694.

The spelling of 20349999 in words is "twenty million, three hundred forty-nine thousand, nine hundred ninety-nine".