20434872 has 32 divisors (see below), whose sum is σ = 51313680. Its totient is φ = 6781440.

The previous prime is 20434871. The next prime is 20434873. The reversal of 20434872 is 27843402.

It is an interprime number because it is at equal distance from previous prime (20434871) and next prime (20434873).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434871) 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, 4018 + ... + 7550.

Almost surely, 2^20434872 is an apocalyptic number.

It is an amenable number.

20434872 is an abundant number, since it is smaller than the sum of its proper divisors (30878808).

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

20434872 is a wasteful number, since it uses less digits than its factorization.

20434872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783 (or 3779 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20434872 is about 4520.4946631978. The cubic root of 20434872 is about 273.3950458845.

The spelling of 20434872 in words is "twenty million, four hundred thirty-four thousand, eight hundred seventy-two".