20387732 has 12 divisors (see below), whose sum is σ = 36167796. Its totient is φ = 10054080.

The previous prime is 20387713. The next prime is 20387747. The reversal of 20387732 is 23778302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6220036 + 14167696 = 2494^2 + 3764^2 .

It is a super-2 number, since 2×20387732² = 831319232207648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 34619 + ... + 35202.

It is an arithmetic number, because the mean of its divisors is an integer number (3013983).

Almost surely, 2^20387732 is an apocalyptic number.

It is an amenable number.

20387732 is a deficient number, since it is larger than the sum of its proper divisors (15780064).

20387732 is a wasteful number, since it uses less digits than its factorization.

20387732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69898 (or 69896 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20387732 is about 4515.2776215865. The cubic root of 20387732 is about 273.1846577263.

The spelling of 20387732 in words is "twenty million, three hundred eighty-seven thousand, seven hundred thirty-two".