20280242 has 4 divisors (see below), whose sum is σ = 30420366. Its totient is φ = 10140120.

The previous prime is 20280229. The next prime is 20280259. The reversal of 20280242 is 24208202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24208202 = 2 ⋅12104101.

It can be written as a sum of positive squares in only one way, i.e., 19175641 + 1104601 = 4379^2 + 1051^2 .

It is a super-2 number, since 2×20280242² = 822576431157128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5070059 + ... + 5070062.

Almost surely, 2^20280242 is an apocalyptic number.

20280242 is a deficient number, since it is larger than the sum of its proper divisors (10140124).

20280242 is a wasteful number, since it uses less digits than its factorization.

20280242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10140123.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20280242 is about 4503.3589685922. The cubic root of 20280242 is about 272.7037087452.

Adding to 20280242 its reverse (24208202), we get a palindrome (44488444).

The spelling of 20280242 in words is "twenty million, two hundred eighty thousand, two hundred forty-two".