20672242 has 4 divisors (see below), whose sum is σ = 31008366. Its totient is φ = 10336120.

The previous prime is 20672237. The next prime is 20672261. The reversal of 20672242 is 24227602.

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., 11363641 + 9308601 = 3371^2 + 3051^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5168059 + ... + 5168062.

Almost surely, 2^20672242 is an apocalyptic number.

20672242 is a deficient number, since it is larger than the sum of its proper divisors (10336124).

20672242 is a wasteful number, since it uses less digits than its factorization.

20672242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10336123.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20672242 is about 4546.6737292223. The cubic root of 20672242 is about 274.4495523875.

Adding to 20672242 its reverse (24227602), we get a palindrome (44899844).

The spelling of 20672242 in words is "twenty million, six hundred seventy-two thousand, two hundred forty-two".