20179220 has 24 divisors (see below), whose sum is σ = 43178184. Its totient is φ = 7918976.

The previous prime is 20179217. The next prime is 20179231. The reversal of 20179220 is 2297102.

It can be written as a sum of positive squares in 4 ways, for example, as 126736 + 20052484 = 356^2 + 4478^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8459 + ... + 10578.

It is an arithmetic number, because the mean of its divisors is an integer number (1799091).

Almost surely, 2^20179220 is an apocalyptic number.

20179220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20179220 is an abundant number, since it is smaller than the sum of its proper divisors (22998964).

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

20179220 is a wasteful number, since it uses less digits than its factorization.

20179220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19099 (or 19097 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20179220 is about 4492.1286713539. The cubic root of 20179220 is about 272.2501483375.

The spelling of 20179220 in words is "twenty million, one hundred seventy-nine thousand, two hundred twenty".