20311928 has 32 divisors (see below), whose sum is σ = 46875360. Its totient is φ = 8035200.

The previous prime is 20311903. The next prime is 20311937. The reversal of 20311928 is 82911302.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 20311897 and 20311906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13223 + ... + 14678.

It is an arithmetic number, because the mean of its divisors is an integer number (1464855).

Almost surely, 2^20311928 is an apocalyptic number.

20311928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20311928 is an abundant number, since it is smaller than the sum of its proper divisors (26563432).

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

20311928 is a wasteful number, since it uses less digits than its factorization.

20311928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27927 (or 27923 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20311928 is about 4506.8756361808. The cubic root of 20311928 is about 272.8456596059.

The spelling of 20311928 in words is "twenty million, three hundred eleven thousand, nine hundred twenty-eight".