20777472 has 120 divisors (see below), whose sum is σ = 62558496. Its totient is φ = 6884352.

The previous prime is 20777443. The next prime is 20777483. The reversal of 20777472 is 27477702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124333 + ... + 124499.

Almost surely, 2^20777472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20777472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31279248).

20777472 is an abundant number, since it is smaller than the sum of its proper divisors (41781024).

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

20777472 is an frugal number, since it uses more digits than its factorization.

20777472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 20777472 is about 4558.2312359072. The cubic root of 20777472 is about 274.9144505242.

The spelling of 20777472 in words is "twenty million, seven hundred seventy-seven thousand, four hundred seventy-two".