20949180 has 96 divisors (see below), whose sum is σ = 69242880. Its totient is φ = 4631040.

The previous prime is 20949167. The next prime is 20949199. The reversal of 20949180 is 8194902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12216 + ... + 13824.

It is an arithmetic number, because the mean of its divisors is an integer number (721280).

Almost surely, 2^20949180 is an apocalyptic number.

20949180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34621440).

20949180 is an abundant number, since it is smaller than the sum of its proper divisors (48293700).

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

20949180 is a wasteful number, since it uses less digits than its factorization.

20949180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20949180 is about 4577.0274196251. The cubic root of 20949180 is about 275.6696846532.

The spelling of 20949180 in words is "twenty million, nine hundred forty-nine thousand, one hundred eighty".