20990583 has 12 divisors (see below), whose sum is σ = 31443048. Its totient is φ = 13993560.

The previous prime is 20990551. The next prime is 20990587. The reversal of 20990583 is 38509902.

It is not a de Polignac number, because 20990583 - 2⁵ = 20990551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42948 + ... + 43433.

It is an arithmetic number, because the mean of its divisors is an integer number (2620254).

Almost surely, 2^20990583 is an apocalyptic number.

20990583 is a deficient number, since it is larger than the sum of its proper divisors (10452465).

20990583 is an frugal number, since it uses more digits than its factorization.

20990583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86396 (or 86384 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20990583 is about 4581.5481008061. The cubic root of 20990583 is about 275.8511721247.

The spelling of 20990583 in words is "twenty million, nine hundred ninety thousand, five hundred eighty-three".