20644834 has 16 divisors (see below), whose sum is σ = 37473408. Its totient is φ = 8327232.

The previous prime is 20644831. The next prime is 20644837. The reversal of 20644834 is 43844602.

It is an interprime number because it is at equal distance from previous prime (20644831) and next prime (20644837).

It is a junction number, because it is equal to n+sod(n) for n = 20644796 and 20644805.

It is not an unprimeable number, because it can be changed into a prime (20644831) 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, 43134 + ... + 43609.

It is an arithmetic number, because the mean of its divisors is an integer number (2342088).

Almost surely, 2^20644834 is an apocalyptic number.

20644834 is a deficient number, since it is larger than the sum of its proper divisors (16828574).

20644834 is a wasteful number, since it uses less digits than its factorization.

20644834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86769.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 20644834 is about 4543.6586579540. The cubic root of 20644834 is about 274.3282070565.

The spelling of 20644834 in words is "twenty million, six hundred forty-four thousand, eight hundred thirty-four".