20431719 has 24 divisors (see below), whose sum is σ = 36796032. Its totient is φ = 10613520.

The previous prime is 20431687. The next prime is 20431721. The reversal of 20431719 is 91713402.

It is not a de Polignac number, because 20431719 - 2⁵ = 20431687 is a prime.

It is a super-2 number, since 2×20431719² = 834910282589922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20431692 and 20431701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14049 + ... + 15434.

It is an arithmetic number, because the mean of its divisors is an integer number (1533168).

Almost surely, 2^20431719 is an apocalyptic number.

20431719 is a deficient number, since it is larger than the sum of its proper divisors (16364313).

20431719 is a wasteful number, since it uses less digits than its factorization.

20431719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29507 (or 29504 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20431719 is about 4520.1459047248. The cubic root of 20431719 is about 273.3809839921.

The spelling of 20431719 in words is "twenty million, four hundred thirty-one thousand, seven hundred nineteen".