20745099 has 24 divisors (see below), whose sum is σ = 31403120. Its totient is φ = 13533696.

The previous prime is 20745091. The next prime is 20745119. The reversal of 20745099 is 99054702.

It is not a de Polignac number, because 20745099 - 2³ = 20745091 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745091) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 213819 + ... + 213915.

Almost surely, 2^20745099 is an apocalyptic number.

20745099 is a deficient number, since it is larger than the sum of its proper divisors (10658021).

20745099 is an frugal number, since it uses more digits than its factorization.

20745099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20745099 is about 4554.6788031649. The cubic root of 20745099 is about 274.7715965761.

The spelling of 20745099 in words is "twenty million, seven hundred forty-five thousand, ninety-nine".