20431395 has 12 divisors (see below), whose sum is σ = 35414496. Its totient is φ = 10896720.

The previous prime is 20431381. The next prime is 20431409. The reversal of 20431395 is 59313402.

It is an interprime number because it is at equal distance from previous prime (20431381) and next prime (20431409).

It is not a de Polignac number, because 20431395 - 2⁷ = 20431267 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226971 + ... + 227060.

It is an arithmetic number, because the mean of its divisors is an integer number (2951208).

Almost surely, 2^20431395 is an apocalyptic number.

20431395 is a deficient number, since it is larger than the sum of its proper divisors (14983101).

20431395 is a wasteful number, since it uses less digits than its factorization.

20431395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454042 (or 454039 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20431395 is about 4520.1100650316. The cubic root of 20431395 is about 273.3795389202.

Adding to 20431395 its reverse (59313402), we get a palindrome (79744797).

The spelling of 20431395 in words is "twenty million, four hundred thirty-one thousand, three hundred ninety-five".