20545557 has 8 divisors (see below), whose sum is σ = 27446880. Its totient is φ = 13670640.

The previous prime is 20545531. The next prime is 20545573. The reversal of 20545557 is 75554502.

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

It is not a de Polignac number, because 20545557 - 2⁶ = 20545493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545597) 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, 4707 + ... + 7952.

It is an arithmetic number, because the mean of its divisors is an integer number (3430860).

Almost surely, 2^20545557 is an apocalyptic number.

It is an amenable number.

20545557 is a deficient number, since it is larger than the sum of its proper divisors (6901323).

20545557 is a wasteful number, since it uses less digits than its factorization.

20545557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13203.

The product of its (nonzero) digits is 35000, while the sum is 33.

The square root of 20545557 is about 4532.7207061543. The cubic root of 20545557 is about 273.8877699391.

The spelling of 20545557 in words is "twenty million, five hundred forty-five thousand, five hundred fifty-seven".