20749994 has 16 divisors (see below), whose sum is σ = 32218560. Its totient is φ = 10016160.

The previous prime is 20749987. The next prime is 20749997. The reversal of 20749994 is 49994702.

It is not an unprimeable number, because it can be changed into a prime (20749997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6299 + ... + 9009.

It is an arithmetic number, because the mean of its divisors is an integer number (2013660).

Almost surely, 2^20749994 is an apocalyptic number.

20749994 is a deficient number, since it is larger than the sum of its proper divisors (11468566).

20749994 is a wasteful number, since it uses less digits than its factorization.

20749994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20749994 is about 4555.2161309865. The cubic root of 20749994 is about 274.7932065187.

The spelling of 20749994 in words is "twenty million, seven hundred forty-nine thousand, nine hundred ninety-four".