20453684 has 12 divisors (see below), whose sum is σ = 35928900. Its totient is φ = 10188288.

The previous prime is 20453683. The next prime is 20453687. The reversal of 20453684 is 48635402.

It can be written as a sum of positive squares in 2 ways, for example, as 8702500 + 11751184 = 2950^2 + 3428^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20453684.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8429 + ... + 10580.

It is an arithmetic number, because the mean of its divisors is an integer number (2994075).

Almost surely, 2^20453684 is an apocalyptic number.

It is an amenable number.

20453684 is a deficient number, since it is larger than the sum of its proper divisors (15475216).

20453684 is a wasteful number, since it uses less digits than its factorization.

20453684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19282 (or 19280 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 20453684 is about 4522.5749302803. The cubic root of 20453684 is about 273.4789144498.

The spelling of 20453684 in words is "twenty million, four hundred fifty-three thousand, six hundred eighty-four".