20159220 has 48 divisors (see below), whose sum is σ = 57173760. Its totient is φ = 5306496.

The previous prime is 20159203. The next prime is 20159261. The reversal of 20159220 is 2295102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (1191120).

Almost surely, 2^20159220 is an apocalyptic number.

20159220 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 20159220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28586880).

20159220 is an abundant number, since it is smaller than the sum of its proper divisors (37014540).

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

20159220 is a wasteful number, since it uses less digits than its factorization.

20159220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344 (or 4342 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20159220 is about 4489.9020033849. The cubic root of 20159220 is about 272.1601745453.

The spelling of 20159220 in words is "twenty million, one hundred fifty-nine thousand, two hundred twenty".