20949516 has 72 divisors (see below), whose sum is σ = 62782720. Its totient is φ = 5983632.

The previous prime is 20949499. The next prime is 20949529. The reversal of 20949516 is 61594902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5265 + ... + 8343.

Almost surely, 2^20949516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31391360).

20949516 is an abundant number, since it is smaller than the sum of its proper divisors (41833204).

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

20949516 is a wasteful number, since it uses less digits than its factorization.

20949516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105 (or 3091 counting only the distinct ones).

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

The square root of 20949516 is about 4577.0641245235. The cubic root of 20949516 is about 275.6711584502.

The spelling of 20949516 in words is "twenty million, nine hundred forty-nine thousand, five hundred sixteen".