20995455 has 32 divisors (see below), whose sum is σ = 36739584. Its totient is φ = 10175616.

The previous prime is 20995439. The next prime is 20995489. The reversal of 20995455 is 55459902.

It is not a de Polignac number, because 20995455 - 2⁴ = 20995439 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 12262 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (1148112).

Almost surely, 2^20995455 is an apocalyptic number.

20995455 is a deficient number, since it is larger than the sum of its proper divisors (15744129).

20995455 is a wasteful number, since it uses less digits than its factorization.

20995455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 20995455 is about 4582.0797679656. The cubic root of 20995455 is about 275.8725125348.

The spelling of 20995455 in words is "twenty million, nine hundred ninety-five thousand, four hundred fifty-five".