20390034 has 32 divisors (see below), whose sum is σ = 47869056. Its totient is φ = 5667840.

The previous prime is 20390017. The next prime is 20390039. The reversal of 20390034 is 43009302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20390039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5007 + ... + 8114.

It is an arithmetic number, because the mean of its divisors is an integer number (1495908).

Almost surely, 2^20390034 is an apocalyptic number.

20390034 is an abundant number, since it is smaller than the sum of its proper divisors (27479022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20390034 is a wasteful number, since it uses less digits than its factorization.

20390034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20390034 is about 4515.5325267348. The cubic root of 20390034 is about 273.1949391939.

Adding to 20390034 its reverse (43009302), we get a palindrome (63399336).

The spelling of 20390034 in words is "twenty million, three hundred ninety thousand, thirty-four".