20351431 has 8 divisors (see below), whose sum is σ = 21608640. Its totient is φ = 19100928.

The previous prime is 20351381. The next prime is 20351437. The reversal of 20351431 is 13415302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20351431 - 2¹¹ = 20349383 is a prime.

It is a super-2 number, since 2×20351431² = 828361487495522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20351399 and 20351408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351437) 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 7 ways as a sum of consecutive naturals, for example, 5490 + ... + 8416.

It is an arithmetic number, because the mean of its divisors is an integer number (2701080).

Almost surely, 2^20351431 is an apocalyptic number.

20351431 is a deficient number, since it is larger than the sum of its proper divisors (1257209).

20351431 is a wasteful number, since it uses less digits than its factorization.

20351431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20351431 is about 4511.2560335233. The cubic root of 20351431 is about 273.0224234333.

Adding to 20351431 its reverse (13415302), we get a palindrome (33766733).

The spelling of 20351431 in words is "twenty million, three hundred fifty-one thousand, four hundred thirty-one".