19941557 has 8 divisors (see below), whose sum is σ = 20771712. Its totient is φ = 19126800.

The previous prime is 19941553. The next prime is 19941563. The reversal of 19941557 is 75514991.

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 19941557 - 2² = 19941553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19941553) 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, 1169 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (2596464).

Almost surely, 2^19941557 is an apocalyptic number.

It is an amenable number.

19941557 is a deficient number, since it is larger than the sum of its proper divisors (830155).

19941557 is an equidigital number, since it uses as much as digits as its factorization.

19941557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699.

The product of its digits is 56700, while the sum is 41.

The square root of 19941557 is about 4465.5970485479. The cubic root of 19941557 is about 271.1771058559.

The spelling of 19941557 in words is "nineteen million, nine hundred forty-one thousand, five hundred fifty-seven".