20109432 has 32 divisors (see below), whose sum is σ = 57456000. Its totient is φ = 5745504.

The previous prime is 20109431. The next prime is 20109451. The reversal of 20109432 is 23490102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20109399 and 20109408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109431) 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, 59682 + ... + 60017.

It is an arithmetic number, because the mean of its divisors is an integer number (1795500).

Almost surely, 2^20109432 is an apocalyptic number.

It is an amenable number.

20109432 is an abundant number, since it is smaller than the sum of its proper divisors (37346568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20109432 is a wasteful number, since it uses less digits than its factorization.

20109432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119715 (or 119711 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20109432 is about 4484.3541340978. The cubic root of 20109432 is about 271.9359350271.

Adding to 20109432 its reverse (23490102), we get a palindrome (43599534).

The spelling of 20109432 in words is "twenty million, one hundred nine thousand, four hundred thirty-two".