20316720 has 40 divisors (see below), whose sum is σ = 62982576. Its totient is φ = 5417728.

The previous prime is 20316713. The next prime is 20316761. The reversal of 20316720 is 2761302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20316720² = 825538223116800, which contains 22 as substring.

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, 42087 + ... + 42566.

Almost surely, 2^20316720 is an apocalyptic number.

20316720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20316720 is an abundant number, since it is smaller than the sum of its proper divisors (42665856).

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

20316720 is a wasteful number, since it uses less digits than its factorization.

20316720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84669 (or 84663 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20316720 is about 4507.4072369823. The cubic root of 20316720 is about 272.8671145460.

The spelling of 20316720 in words is "twenty million, three hundred sixteen thousand, seven hundred twenty".