20742132 has 12 divisors (see below), whose sum is σ = 48398336. Its totient is φ = 6914040.

The previous prime is 20742109. The next prime is 20742151. The reversal of 20742132 is 23124702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20742099 and 20742108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864244 + ... + 864267.

Almost surely, 2^20742132 is an apocalyptic number.

It is an amenable number.

20742132 is an abundant number, since it is smaller than the sum of its proper divisors (27656204).

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

20742132 is a wasteful number, since it uses less digits than its factorization.

20742132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728518 (or 1728516 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20742132 is about 4554.3530824915. The cubic root of 20742132 is about 274.7584965150.

Adding to 20742132 its reverse (23124702), we get a palindrome (43866834).

The spelling of 20742132 in words is "twenty million, seven hundred forty-two thousand, one hundred thirty-two".