20949573 has 8 divisors (see below), whose sum is σ = 29147328. Its totient is φ = 13359104.

The previous prime is 20949563. The next prime is 20949601. The reversal of 20949573 is 37594902.

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 20949573 - 2⁵ = 20949541 is a prime.

It is a super-3 number, since 3×20949573³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949563) 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, 151740 + ... + 151877.

It is an arithmetic number, because the mean of its divisors is an integer number (3643416).

Almost surely, 2^20949573 is an apocalyptic number.

20949573 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20949573 is a deficient number, since it is larger than the sum of its proper divisors (8197755).

20949573 is a wasteful number, since it uses less digits than its factorization.

20949573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303643.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 20949573 is about 4577.0703512181. The cubic root of 20949573 is about 275.6714084678.

The spelling of 20949573 in words is "twenty million, nine hundred forty-nine thousand, five hundred seventy-three".