20543961 has 8 divisors (see below), whose sum is σ = 27425664. Its totient is φ = 13679120.

The previous prime is 20543953. The next prime is 20543969. The reversal of 20543961 is 16934502.

It is an interprime number because it is at equal distance from previous prime (20543953) and next prime (20543969).

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 20543961 - 2³ = 20543953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20543969) 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, 1026 + ... + 6491.

It is an arithmetic number, because the mean of its divisors is an integer number (3428208).

Almost surely, 2^20543961 is an apocalyptic number.

It is an amenable number.

20543961 is a deficient number, since it is larger than the sum of its proper divisors (6881703).

20543961 is an equidigital number, since it uses as much as digits as its factorization.

20543961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20543961 is about 4532.5446495319. The cubic root of 20543961 is about 273.8806777942.

The spelling of 20543961 in words is "twenty million, five hundred forty-three thousand, nine hundred sixty-one".