20219220 has 120 divisors (see below), whose sum is σ = 72530304. Its totient is φ = 4618944.

The previous prime is 20219219. The next prime is 20219237. The reversal of 20219220 is 2291202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20219193 and 20219202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10449 + ... + 12231.

Almost surely, 2^20219220 is an apocalyptic number.

20219220 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 20219220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36265152).

20219220 is an abundant number, since it is smaller than the sum of its proper divisors (52311084).

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

20219220 is a wasteful number, since it uses less digits than its factorization.

20219220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20219220 is about 4496.5786994114. The cubic root of 20219220 is about 272.4299177294.

The spelling of 20219220 in words is "twenty million, two hundred nineteen thousand, two hundred twenty".