20431950 has 192 divisors, whose sum is σ = 66424320. Its totient is φ = 4032000.

The previous prime is 20431913. The next prime is 20431951. The reversal of 20431950 is 5913402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431951) 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 95 ways as a sum of consecutive naturals, for example, 334920 + ... + 334980.

It is an arithmetic number, because the mean of its divisors is an integer number (345960).

Almost surely, 2^20431950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33212160).

20431950 is an abundant number, since it is smaller than the sum of its proper divisors (45992370).

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

20431950 is a wasteful number, since it uses less digits than its factorization.

20431950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20431950 is about 4520.1714569251. The cubic root of 20431950 is about 273.3820142654.

It can be divided in two parts, 2043 and 1950, that added together give a palindrome (3993).

The spelling of 20431950 in words is "twenty million, four hundred thirty-one thousand, nine hundred fifty".