20476720 has 40 divisors (see below), whose sum is σ = 51938640. Its totient is φ = 7445760.

The previous prime is 20476667. The next prime is 20476723. The reversal of 20476720 is 2767402.

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

It is not an unprimeable number, because it can be changed into a prime (20476723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10755 + ... + 12514.

It is an arithmetic number, because the mean of its divisors is an integer number (1298466).

Almost surely, 2^20476720 is an apocalyptic number.

20476720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20476720 is an abundant number, since it is smaller than the sum of its proper divisors (31461920).

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

20476720 is a wasteful number, since it uses less digits than its factorization.

20476720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23293 (or 23287 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20476720 is about 4525.1209928575. The cubic root of 20476720 is about 273.5815446439.

The spelling of 20476720 in words is "twenty million, four hundred seventy-six thousand, seven hundred twenty".