20311740 has 36 divisors (see below), whose sum is σ = 61612824. Its totient is φ = 5416416.

The previous prime is 20311723. The next prime is 20311763. The reversal of 20311740 is 4711302.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 56242 + ... + 56601.

Almost surely, 2^20311740 is an apocalyptic number.

20311740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311740 is an abundant number, since it is smaller than the sum of its proper divisors (41301084).

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

20311740 is a wasteful number, since it uses less digits than its factorization.

20311740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112858 (or 112853 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20311740 is about 4506.8547791115. The cubic root of 20311740 is about 272.8448178158.

The spelling of 20311740 in words is "twenty million, three hundred eleven thousand, seven hundred forty".