20311004 has 12 divisors (see below), whose sum is σ = 40622064. Its totient is φ = 8704704.

The previous prime is 20310973. The next prime is 20311043. The reversal of 20311004 is 40011302.

It is a happy number.

20311004 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362669 + ... + 362724.

It is an arithmetic number, because the mean of its divisors is an integer number (3385172).

Almost surely, 2^20311004 is an apocalyptic number.

It is an amenable number.

20311004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311004 is a wasteful number, since it uses less digits than its factorization.

20311004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725404 (or 725402 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20311004 is about 4506.7731249753. The cubic root of 20311004 is about 272.8415222470.

Adding to 20311004 its reverse (40011302), we get a palindrome (60322306).

The spelling of 20311004 in words is "twenty million, three hundred eleven thousand, four".