20547432 has 80 divisors (see below), whose sum is σ = 59176260. Its totient is φ = 6656256.

The previous prime is 20547431. The next prime is 20547433. The reversal of 20547432 is 23474502.

It is an interprime number because it is at equal distance from previous prime (20547431) and next prime (20547433).

It can be written as a sum of positive squares in 2 ways, for example, as 16112196 + 4435236 = 4014^2 + 2106^2 .

It is a super-4 number, since 4×20547432⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20547396 and 20547405.

It is not an unprimeable number, because it can be changed into a prime (20547431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23548 + ... + 24404.

Almost surely, 2^20547432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20547432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29588130).

20547432 is an abundant number, since it is smaller than the sum of its proper divisors (38628828).

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

20547432 is a wasteful number, since it uses less digits than its factorization.

20547432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20547432 is about 4532.9275308569. The cubic root of 20547432 is about 273.8961014070.

The spelling of 20547432 in words is "twenty million, five hundred forty-seven thousand, four hundred thirty-two".