20955491 has 8 divisors (see below), whose sum is σ = 21525504. Its totient is φ = 20389320.

The previous prime is 20955479. The next prime is 20955497. The reversal of 20955491 is 19455902.

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 20955491 - 2⁶ = 20955427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955497) 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, 12590 + ... + 14156.

It is an arithmetic number, because the mean of its divisors is an integer number (2690688).

Almost surely, 2^20955491 is an apocalyptic number.

20955491 is a deficient number, since it is larger than the sum of its proper divisors (570013).

20955491 is a wasteful number, since it uses less digits than its factorization.

20955491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 20955491 is about 4577.7167889681. The cubic root of 20955491 is about 275.6973639658.

The spelling of 20955491 in words is "twenty million, nine hundred fifty-five thousand, four hundred ninety-one".