20742532 has 6 divisors (see below), whose sum is σ = 36299438. Its totient is φ = 10371264.

The previous prime is 20742523. The next prime is 20742539. The reversal of 20742532 is 23524702.

It can be written as a sum of positive squares in only one way, i.e., 13645636 + 7096896 = 3694^2 + 2664^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20742497 and 20742506.

It is not an unprimeable number, because it can be changed into a prime (20742539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2592813 + ... + 2592820.

Almost surely, 2^20742532 is an apocalyptic number.

It is an amenable number.

20742532 is a deficient number, since it is larger than the sum of its proper divisors (15556906).

20742532 is a wasteful number, since it uses less digits than its factorization.

20742532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5185637 (or 5185635 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20742532 is about 4554.3969963103. The cubic root of 20742532 is about 274.7602626898.

The spelling of 20742532 in words is "twenty million, seven hundred forty-two thousand, five hundred thirty-two".