20307842 has 8 divisors (see below), whose sum is σ = 30804300. Its totient is φ = 10039744.

The previous prime is 20307817. The next prime is 20307863. The reversal of 20307842 is 24870302.

It can be written as a sum of positive squares in 2 ways, for example, as 20259001 + 48841 = 4501^2 + 221^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56867 + ... + 57222.

Almost surely, 2^20307842 is an apocalyptic number.

20307842 is a deficient number, since it is larger than the sum of its proper divisors (10496458).

20307842 is a wasteful number, since it uses less digits than its factorization.

20307842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114180.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20307842 is about 4506.4223059984. The cubic root of 20307842 is about 272.8273629327.

The spelling of 20307842 in words is "twenty million, three hundred seven thousand, eight hundred forty-two".