20553407 has 8 divisors (see below), whose sum is σ = 23519232. Its totient is φ = 17595000.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553407 is 70435502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20553407 is a prime.

It is a super-3 number, since 3×20553407³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6782 + ... + 9332.

It is an arithmetic number, because the mean of its divisors is an integer number (2939904).

Almost surely, 2^20553407 is an apocalyptic number.

20553407 is a deficient number, since it is larger than the sum of its proper divisors (2965825).

20553407 is a wasteful number, since it uses less digits than its factorization.

20553407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3709.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20553407 is about 4533.5865493007. The cubic root of 20553407 is about 273.9226476376.

Adding to 20553407 its reverse (70435502), we get a palindrome (90988909).

The spelling of 20553407 in words is "twenty million, five hundred fifty-three thousand, four hundred seven".