20720492 has 12 divisors (see below), whose sum is σ = 39050256. Its totient is φ = 9563280.

The previous prime is 20720459. The next prime is 20720519. The reversal of 20720492 is 29402702.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199184 + ... + 199287.

It is an arithmetic number, because the mean of its divisors is an integer number (3254188).

Almost surely, 2^20720492 is an apocalyptic number.

It is an amenable number.

20720492 is a deficient number, since it is larger than the sum of its proper divisors (18329764).

20720492 is a wasteful number, since it uses less digits than its factorization.

20720492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398488 (or 398486 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20720492 is about 4551.9767134730. The cubic root of 20720492 is about 274.6629125962.

It can be divided in two parts, 20720 and 492, that added together give a palindrome (21212).

The spelling of 20720492 in words is "twenty million, seven hundred twenty thousand, four hundred ninety-two".