20542749 has 32 divisors (see below), whose sum is σ = 30772224. Its totient is φ = 12122880.

The previous prime is 20542741. The next prime is 20542751. The reversal of 20542749 is 94724502.

It is not a de Polignac number, because 20542749 - 2³ = 20542741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97254 + ... + 97464.

It is an arithmetic number, because the mean of its divisors is an integer number (961632).

Almost surely, 2^20542749 is an apocalyptic number.

It is an amenable number.

20542749 is a deficient number, since it is larger than the sum of its proper divisors (10229475).

20542749 is a wasteful number, since it uses less digits than its factorization.

20542749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20542749 is about 4532.4109478290. The cubic root of 20542749 is about 273.8752917847.

The spelling of 20542749 in words is "twenty million, five hundred forty-two thousand, seven hundred forty-nine".