20219957 has 8 divisors (see below), whose sum is σ = 20465280. Its totient is φ = 19976400.

The previous prime is 20219951. The next prime is 20220007. The reversal of 20219957 is 75991202.

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 20219957 - 2⁶ = 20219893 is a prime.

It is a super-2 number, since 2×20219957² = 817693322163698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219951) 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, 54023 + ... + 54395.

It is an arithmetic number, because the mean of its divisors is an integer number (2558160).

Almost surely, 2^20219957 is an apocalyptic number.

It is an amenable number.

20219957 is a deficient number, since it is larger than the sum of its proper divisors (245323).

20219957 is a wasteful number, since it uses less digits than its factorization.

20219957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20219957 is about 4496.6606498601. The cubic root of 20219957 is about 272.4332277550.

The spelling of 20219957 in words is "twenty million, two hundred nineteen thousand, nine hundred fifty-seven".