20264820 has 72 divisors (see below), whose sum is σ = 58410912. Its totient is φ = 5248320.

The previous prime is 20264819. The next prime is 20264851. The reversal of 20264820 is 2846202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285385 + ... + 285455.

Almost surely, 2^20264820 is an apocalyptic number.

20264820 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 20264820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29205456).

20264820 is an abundant number, since it is smaller than the sum of its proper divisors (38146092).

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

20264820 is a wasteful number, since it uses less digits than its factorization.

20264820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 148 counting only the distinct ones).

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

The square root of 20264820 is about 4501.6463654978. The cubic root of 20264820 is about 272.6345658639.

The spelling of 20264820 in words is "twenty million, two hundred sixty-four thousand, eight hundred twenty".