20631242 has 4 divisors (see below), whose sum is σ = 30946866. Its totient is φ = 10315620.

The previous prime is 20631229. The next prime is 20631263. The reversal of 20631242 is 24213602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12952801 + 7678441 = 3599^2 + 2771^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157809 + ... + 5157812.

Almost surely, 2^20631242 is an apocalyptic number.

20631242 is a deficient number, since it is larger than the sum of its proper divisors (10315624).

20631242 is a wasteful number, since it uses less digits than its factorization.

20631242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315623.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20631242 is about 4542.1627007407. The cubic root of 20631242 is about 274.2679904170.

Adding to 20631242 its reverse (24213602), we get a palindrome (44844844).

The spelling of 20631242 in words is "twenty million, six hundred thirty-one thousand, two hundred forty-two".