20687132 has 6 divisors (see below), whose sum is σ = 36202488. Its totient is φ = 10343564.

The previous prime is 20687131. The next prime is 20687141. The reversal of 20687132 is 23178602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20687095 and 20687104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2585888 + ... + 2585895.

It is an arithmetic number, because the mean of its divisors is an integer number (6033748).

Almost surely, 2^20687132 is an apocalyptic number.

It is an amenable number.

20687132 is a deficient number, since it is larger than the sum of its proper divisors (15515356).

20687132 is a wasteful number, since it uses less digits than its factorization.

20687132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171787 (or 5171785 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20687132 is about 4548.3108952665. The cubic root of 20687132 is about 274.5154309548.

The spelling of 20687132 in words is "twenty million, six hundred eighty-seven thousand, one hundred thirty-two".