20219457 has 8 divisors (see below), whose sum is σ = 27165600. Its totient is φ = 13376480.

The previous prime is 20219453. The next prime is 20219473. The reversal of 20219457 is 75491202.

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 20219457 - 2² = 20219453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20219453) 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, 25332 + ... + 26117.

It is an arithmetic number, because the mean of its divisors is an integer number (3395700).

Almost surely, 2^20219457 is an apocalyptic number.

It is an amenable number.

20219457 is a deficient number, since it is larger than the sum of its proper divisors (6946143).

20219457 is a wasteful number, since it uses less digits than its factorization.

20219457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51583.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20219457 is about 4496.6050527037. The cubic root of 20219457 is about 272.4309821562.

The spelling of 20219457 in words is "twenty million, two hundred nineteen thousand, four hundred fifty-seven".