20431004 has 24 divisors (see below), whose sum is σ = 41059200. Its totient is φ = 8797680.

The previous prime is 20431003. The next prime is 20431007. The reversal of 20431004 is 40013402.

It is a super-3 number, since 3×20431004³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20431004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11384 + ... + 13055.

It is an arithmetic number, because the mean of its divisors is an integer number (1710800).

Almost surely, 2^20431004 is an apocalyptic number.

It is an amenable number.

20431004 is an abundant number, since it is smaller than the sum of its proper divisors (20628196).

20431004 is a wasteful number, since it uses less digits than its factorization.

20431004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24473 (or 24471 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20431004 is about 4520.0668136655. The cubic root of 20431004 is about 273.3777950014.

Adding to 20431004 its reverse (40013402), we get a palindrome (60444406).

The spelling of 20431004 in words is "twenty million, four hundred thirty-one thousand, four".