20453855 has 8 divisors (see below), whose sum is σ = 24570000. Its totient is φ = 16346176.

The previous prime is 20453821. The next prime is 20453863. The reversal of 20453855 is 55835402.

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

It is a cyclic number.

It is not a de Polignac number, because 20453855 - 2⁸ = 20453599 is a prime.

It is a super-2 number, since 2×20453855² = 836720368722050, which contains 22 as substring.

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, 6131 + ... + 8859.

It is an arithmetic number, because the mean of its divisors is an integer number (3071250).

Almost surely, 2^20453855 is an apocalyptic number.

20453855 is a deficient number, since it is larger than the sum of its proper divisors (4116145).

20453855 is a wasteful number, since it uses less digits than its factorization.

20453855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 20453855 is about 4522.5938354002. The cubic root of 20453855 is about 273.4796765744.

The spelling of 20453855 in words is "twenty million, four hundred fifty-three thousand, eight hundred fifty-five".