20821234 has 8 divisors (see below), whose sum is σ = 35693568. Its totient is φ = 8923380.

The previous prime is 20821223. The next prime is 20821249. The reversal of 20821234 is 43212802.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743602 + ... + 743629.

It is an arithmetic number, because the mean of its divisors is an integer number (4461696).

Almost surely, 2^20821234 is an apocalyptic number.

20821234 is a deficient number, since it is larger than the sum of its proper divisors (14872334).

20821234 is a wasteful number, since it uses less digits than its factorization.

20821234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487240.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20821234 is about 4563.0290378213. The cubic root of 20821234 is about 275.1073256012.

The spelling of 20821234 in words is "twenty million, eight hundred twenty-one thousand, two hundred thirty-four".