20439954 has 24 divisors (see below), whose sum is σ = 45814860. Its totient is φ = 6578208.

The previous prime is 20439931. The next prime is 20439959. The reversal of 20439954 is 45993402.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 859329 = 4425^2 + 927^2 .

It is not an unprimeable number, because it can be changed into a prime (20439959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19057 + ... + 20100.

Almost surely, 2^20439954 is an apocalyptic number.

20439954 is an abundant number, since it is smaller than the sum of its proper divisors (25374906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20439954 is a wasteful number, since it uses less digits than its factorization.

20439954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39194 (or 39191 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20439954 is about 4521.0567348796. The cubic root of 20439954 is about 273.4177077745.

The spelling of 20439954 in words is "twenty million, four hundred thirty-nine thousand, nine hundred fifty-four".