20820842 has 16 divisors (see below), whose sum is σ = 37245312. Its totient is φ = 8535120.

The previous prime is 20820829. The next prime is 20820851. The reversal of 20820842 is 24802802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32009 + ... + 32652.

It is an arithmetic number, because the mean of its divisors is an integer number (2327832).

Almost surely, 2^20820842 is an apocalyptic number.

20820842 is a deficient number, since it is larger than the sum of its proper divisors (16424470).

20820842 is a wasteful number, since it uses less digits than its factorization.

20820842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64693.

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20820842 is about 4562.9860836956. The cubic root of 20820842 is about 275.1055991145.

The spelling of 20820842 in words is "twenty million, eight hundred twenty thousand, eight hundred forty-two".