20420834 has 8 divisors (see below), whose sum is σ = 35007168. Its totient is φ = 8751780.

The previous prime is 20420821. The next prime is 20420837. The reversal of 20420834 is 43802402.

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

It is a super-2 number, since 2×20420834² = 834020922511112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20420837) 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, 729302 + ... + 729329.

It is an arithmetic number, because the mean of its divisors is an integer number (4375896).

Almost surely, 2^20420834 is an apocalyptic number.

20420834 is a deficient number, since it is larger than the sum of its proper divisors (14586334).

20420834 is a wasteful number, since it uses less digits than its factorization.

20420834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458640.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20420834 is about 4518.9416902633. The cubic root of 20420834 is about 273.3324274542.

The spelling of 20420834 in words is "twenty million, four hundred twenty thousand, eight hundred thirty-four".