20709455 has 32 divisors (see below), whose sum is σ = 28089600. Its totient is φ = 14556672.

The previous prime is 20709433. The next prime is 20709461. The reversal of 20709455 is 55490702.

It is not a de Polignac number, because 20709455 - 2⁶ = 20709391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189941 + ... + 190049.

It is an arithmetic number, because the mean of its divisors is an integer number (877800).

Almost surely, 2^20709455 is an apocalyptic number.

20709455 is a deficient number, since it is larger than the sum of its proper divisors (7380145).

20709455 is a wasteful number, since it uses less digits than its factorization.

20709455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20709455 is about 4550.7642215347. The cubic root of 20709455 is about 274.6141365187.

The spelling of 20709455 in words is "twenty million, seven hundred nine thousand, four hundred fifty-five".