20949471 has 12 divisors (see below), whose sum is σ = 30964648. Its totient is φ = 13641264.

The previous prime is 20949421. The next prime is 20949499. The reversal of 20949471 is 17494902.

It is not a de Polignac number, because 20949471 - 2⁹ = 20948959 is a prime.

It is a super-3 number, since 3×20949471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26680 + ... + 27453.

Almost surely, 2^20949471 is an apocalyptic number.

20949471 is a deficient number, since it is larger than the sum of its proper divisors (10015177).

20949471 is a wasteful number, since it uses less digits than its factorization.

20949471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54182 (or 54179 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20949471 is about 4577.0592087060. The cubic root of 20949471 is about 275.6709610676.

The spelling of 20949471 in words is "twenty million, nine hundred forty-nine thousand, four hundred seventy-one".