20220864 has 112 divisors (see below), whose sum is σ = 59009280. Its totient is φ = 6082560.

The previous prime is 20220839. The next prime is 20220869. The reversal of 20220864 is 46802202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83784 + ... + 84024.

Almost surely, 2^20220864 is an apocalyptic number.

20220864 is a gapful number since it is divisible by the number (24) 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 20220864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29504640).

20220864 is an abundant number, since it is smaller than the sum of its proper divisors (38788416).

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

20220864 is a wasteful number, since it uses less digits than its factorization.

20220864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20220864 is about 4496.7615013474. The cubic root of 20220864 is about 272.4373011768.

The spelling of 20220864 in words is "twenty million, two hundred twenty thousand, eight hundred sixty-four".