20390234 has 8 divisors (see below), whose sum is σ = 30627828. Its totient is φ = 10180960.

The previous prime is 20390221. The next prime is 20390239. The reversal of 20390234 is 43209302.

It can be written as a sum of positive squares in 2 ways, for example, as 12567025 + 7823209 = 3545^2 + 2797^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20390239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5177 + ... + 8220.

Almost surely, 2^20390234 is an apocalyptic number.

20390234 is a deficient number, since it is larger than the sum of its proper divisors (10237594).

20390234 is a wasteful number, since it uses less digits than its factorization.

20390234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14160.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20390234 is about 4515.5546724627. The cubic root of 20390234 is about 273.1958324212.

Adding to 20390234 its reverse (43209302), we get a palindrome (63599536).

The spelling of 20390234 in words is "twenty million, three hundred ninety thousand, two hundred thirty-four".