20670455 has 8 divisors (see below), whose sum is σ = 26712672. Its totient is φ = 15264288.

The previous prime is 20670449. The next prime is 20670467. The reversal of 20670455 is 55407602.

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

It is not a de Polignac number, because 20670455 - 2²⁰ = 19621879 is a prime.

It is a super-3 number, since 3×20670455³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

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, 158939 + ... + 159068.

It is an arithmetic number, because the mean of its divisors is an integer number (3339084).

Almost surely, 2^20670455 is an apocalyptic number.

20670455 is a deficient number, since it is larger than the sum of its proper divisors (6042217).

20670455 is a wasteful number, since it uses less digits than its factorization.

20670455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318025.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20670455 is about 4546.4772076851. The cubic root of 20670455 is about 274.4416439487.

The spelling of 20670455 in words is "twenty million, six hundred seventy thousand, four hundred fifty-five".