20990316 has 24 divisors (see below), whose sum is σ = 50667120. Its totient is φ = 6755392.

The previous prime is 20990311. The next prime is 20990353. The reversal of 20990316 is 61309902.

It is not an unprimeable number, because it can be changed into a prime (20990311) 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, 29811 + ... + 30506.

It is an arithmetic number, because the mean of its divisors is an integer number (2111130).

Almost surely, 2^20990316 is an apocalyptic number.

It is an amenable number.

20990316 is an abundant number, since it is smaller than the sum of its proper divisors (29676804).

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

20990316 is a wasteful number, since it uses less digits than its factorization.

20990316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60353 (or 60351 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20990316 is about 4581.5189620911. The cubic root of 20990316 is about 275.8500025117.

It can be divided in two parts, 209 and 90316, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 20990316 in words is "twenty million, nine hundred ninety thousand, three hundred sixteen".