20840652 has 84 divisors (see below), whose sum is σ = 62554576. Its totient is φ = 5948640.

The previous prime is 20840639. The next prime is 20840653. The reversal of 20840652 is 25604802.

20840652 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 0 + 652 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20840653) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 19902 + ... + 20922.

Almost surely, 2^20840652 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 20840652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31277288).

20840652 is an abundant number, since it is smaller than the sum of its proper divisors (41713924).

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

20840652 is a wasteful number, since it uses less digits than its factorization.

20840652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20840652 is about 4565.1562952434. The cubic root of 20840652 is about 275.1928212421.

The spelling of 20840652 in words is "twenty million, eight hundred forty thousand, six hundred fifty-two".