20189283921 has 9 divisors (see below), whose sum is σ = 29162914729. Its totient is φ = 13459238436.

The previous prime is 20189283911. The next prime is 20189283931. The reversal of 20189283921 is 12938298102.

It is a happy number.

The square root of 20189283921 is 142089.

It is a perfect power (a square), and thus also a powerful number.

20189283921 is a `hidden beast` number, since 201 + 89 + 283 + 92 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (20189283911) and next prime (20189283931).

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20189283921 - 2⁵ = 20189283889 is a prime.

It is a super-3 number, since 3×20189283921³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20189283911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 402586 + ... + 449948.

Almost surely, 2^20189283921 is an apocalyptic number.

20189283921 is the 142089-th square number.

20189283921 is the 71045-th centered octagonal number.

It is an amenable number.

20189283921 is a deficient number, since it is larger than the sum of its proper divisors (8973630808).

20189283921 is an frugal number, since it uses more digits than its factorization.

20189283921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94732 (or 47366 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 20189283921 in words is "twenty billion, one hundred eighty-nine million, two hundred eighty-three thousand, nine hundred twenty-one".