20720888 has 16 divisors (see below), whose sum is σ = 39902280. Its totient is φ = 10080288.

The previous prime is 20720789. The next prime is 20720893. The reversal of 20720888 is 88802702.

It is a congruent number.

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, 34706 + ... + 35297.

Almost surely, 2^20720888 is an apocalyptic number.

It is an amenable number.

20720888 is a deficient number, since it is larger than the sum of its proper divisors (19181392).

20720888 is a wasteful number, since it uses less digits than its factorization.

20720888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70046 (or 70042 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 20720888 is about 4552.0202108514. The cubic root of 20720888 is about 274.6646623266.

The spelling of 20720888 in words is "twenty million, seven hundred twenty thousand, eight hundred eighty-eight".