20264220 has 72 divisors (see below), whose sum is σ = 62121696. Its totient is φ = 5346432.

The previous prime is 20264207. The next prime is 20264227. The reversal of 20264220 is 2246202.

It is a happy number.

20264220 is a `hidden beast` number, since 2 + 0 + 2 + 642 + 20 = 666.

It is a super-2 number, since 2×20264220² = 821277224416800, which contains 22 as substring.

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 = 20264193 and 20264202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17994 + ... + 19086.

Almost surely, 2^20264220 is an apocalyptic number.

20264220 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 20264220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31060848).

20264220 is an abundant number, since it is smaller than the sum of its proper divisors (41857476).

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

20264220 is a wasteful number, since it uses less digits than its factorization.

20264220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20264220 is about 4501.5797227196. The cubic root of 20264220 is about 272.6318751195.

The spelling of 20264220 in words is "twenty million, two hundred sixty-four thousand, two hundred twenty".