20431346 has 32 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 8769600.

The previous prime is 20431343. The next prime is 20431381. The reversal of 20431346 is 64313402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20431343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28796 + ... + 29496.

It is an arithmetic number, because the mean of its divisors is an integer number (1105650).

Almost surely, 2^20431346 is an apocalyptic number.

20431346 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20431346 is a deficient number, since it is larger than the sum of its proper divisors (14949454).

20431346 is a wasteful number, since it uses less digits than its factorization.

20431346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20431346 is about 4520.1046448064. The cubic root of 20431346 is about 273.3793203740.

Adding to 20431346 its reverse (64313402), we get a palindrome (84744748).

The spelling of 20431346 in words is "twenty million, four hundred thirty-one thousand, three hundred forty-six".