20431354 has 4 divisors (see below), whose sum is σ = 30647034. Its totient is φ = 10215676.

The previous prime is 20431343. The next prime is 20431381. The reversal of 20431354 is 45313402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 762129 = 4435^2 + 873^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5107837 + ... + 5107840.

Almost surely, 2^20431354 is an apocalyptic number.

20431354 is a deficient number, since it is larger than the sum of its proper divisors (10215680).

20431354 is a wasteful number, since it uses less digits than its factorization.

20431354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215679.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20431354 is about 4520.1055297415. The cubic root of 20431354 is about 273.3793560551.

Adding to 20431354 its reverse (45313402), we get a palindrome (65744756).

The spelling of 20431354 in words is "twenty million, four hundred thirty-one thousand, three hundred fifty-four".