20742632 has 8 divisors (see below), whose sum is σ = 38892450. Its totient is φ = 10371312.

The previous prime is 20742593. The next prime is 20742637. The reversal of 20742632 is 23624702.

It can be written as a sum of positive squares in only one way, i.e., 10719076 + 10023556 = 3274^2 + 3166^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20742637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1296407 + ... + 1296422.

Almost surely, 2^20742632 is an apocalyptic number.

It is an amenable number.

20742632 is a deficient number, since it is larger than the sum of its proper divisors (18149818).

20742632 is a wasteful number, since it uses less digits than its factorization.

20742632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592835 (or 2592831 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20742632 is about 4554.4079746988. The cubic root of 20742632 is about 274.7607042299.

The spelling of 20742632 in words is "twenty million, seven hundred forty-two thousand, six hundred thirty-two".