20121432 has 16 divisors (see below), whose sum is σ = 50303640. Its totient is φ = 6707136.

The previous prime is 20121427. The next prime is 20121433. The reversal of 20121432 is 23412102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419173 + ... + 419220.

Almost surely, 2^20121432 is an apocalyptic number.

It is an amenable number.

20121432 is an abundant number, since it is smaller than the sum of its proper divisors (30182208).

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

20121432 is a wasteful number, since it uses less digits than its factorization.

20121432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838402 (or 838398 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20121432 is about 4485.6919198714. The cubic root of 20121432 is about 271.9900154928.

Adding to 20121432 its reverse (23412102), we get a palindrome (43533534).

The spelling of 20121432 in words is "twenty million, one hundred twenty-one thousand, four hundred thirty-two".