20409624189 has 72 divisors (see below), whose sum is σ = 31785957632. Its totient is φ = 13094706240.

The previous prime is 20409624127. The next prime is 20409624203. The reversal of 20409624189 is 98142690402.

20409624189 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 9 + 624 + 18 + 9 = 666.

It is not a de Polignac number, because 20409624189 - 2¹² = 20409620093 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 (20409624119) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 20594484 + ... + 20595474.

Almost surely, 2^20409624189 is an apocalyptic number.

It is an amenable number.

20409624189 is a deficient number, since it is larger than the sum of its proper divisors (11376333443).

20409624189 is an frugal number, since it uses more digits than its factorization.

20409624189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 20409624189 in words is "twenty billion, four hundred nine million, six hundred twenty-four thousand, one hundred eighty-nine".