20870242 has 8 divisors (see below), whose sum is σ = 31347036. Its totient is φ = 10421232.

The previous prime is 20870231. The next prime is 20870249. The reversal of 20870242 is 24207802.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 1058841 = 4451^2 + 1029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20870242² = 871134002277128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20870249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4953 + ... + 8140.

Almost surely, 2^20870242 is an apocalyptic number.

20870242 is a deficient number, since it is larger than the sum of its proper divisors (10476794).

20870242 is a wasteful number, since it uses less digits than its factorization.

20870242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13892.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20870242 is about 4568.3959985973. The cubic root of 20870242 is about 275.3230011867.

It can be divided in two parts, 20870 and 242, that added together give a palindrome (21112).

The spelling of 20870242 in words is "twenty million, eight hundred seventy thousand, two hundred forty-two".