20409834 has 16 divisors (see below), whose sum is σ = 41182272. Its totient is φ = 6742848.

The previous prime is 20409833. The next prime is 20409839. The reversal of 20409834 is 43890402.

It is a happy number.

It is a super-2 number, since 2×20409834² = 833122647815112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20409833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14374 + ... + 15729.

It is an arithmetic number, because the mean of its divisors is an integer number (2573892).

Almost surely, 2^20409834 is an apocalyptic number.

20409834 is an abundant number, since it is smaller than the sum of its proper divisors (20772438).

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

20409834 is a wasteful number, since it uses less digits than its factorization.

20409834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30221.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20409834 is about 4517.7244271868. The cubic root of 20409834 is about 273.2833403842.

The spelling of 20409834 in words is "twenty million, four hundred nine thousand, eight hundred thirty-four".