20747672 has 32 divisors (see below), whose sum is σ = 43433280. Its totient is φ = 9209760.

The previous prime is 20747663. The next prime is 20747719. The reversal of 20747672 is 27674702.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1043 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (1357290).

Almost surely, 2^20747672 is an apocalyptic number.

20747672 is a gapful number since it is divisible by the number (22) 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 20747672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21716640).

20747672 is an abundant number, since it is smaller than the sum of its proper divisors (22685608).

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

20747672 is a wasteful number, since it uses less digits than its factorization.

20747672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543 (or 5539 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 35.

The square root of 20747672 is about 4554.9612512073. The cubic root of 20747672 is about 274.7829560156.

The spelling of 20747672 in words is "twenty million, seven hundred forty-seven thousand, six hundred seventy-two".