20949855 has 8 divisors (see below), whose sum is σ = 33519792. Its totient is φ = 11173248.

The previous prime is 20949833. The next prime is 20949857. The reversal of 20949855 is 55894902.

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

It is not a de Polignac number, because 20949855 - 2⁵ = 20949823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698314 + ... + 698343.

It is an arithmetic number, because the mean of its divisors is an integer number (4189974).

Almost surely, 2^20949855 is an apocalyptic number.

20949855 is a deficient number, since it is larger than the sum of its proper divisors (12569937).

20949855 is a wasteful number, since it uses less digits than its factorization.

20949855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396665.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 20949855 is about 4577.1011568459. The cubic root of 20949855 is about 275.6726453902.

The spelling of 20949855 in words is "twenty million, nine hundred forty-nine thousand, eight hundred fifty-five".