20407628 has 24 divisors (see below), whose sum is σ = 37181760. Its totient is φ = 9792720.

The previous prime is 20407613. The next prime is 20407631. The reversal of 20407628 is 82670402.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20407628.

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 7 ways as a sum of consecutive naturals, for example, 9143 + ... + 11153.

It is an arithmetic number, because the mean of its divisors is an integer number (1549240).

Almost surely, 2^20407628 is an apocalyptic number.

It is an amenable number.

20407628 is a deficient number, since it is larger than the sum of its proper divisors (16774132).

20407628 is a wasteful number, since it uses less digits than its factorization.

20407628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20407628 is about 4517.4802711246. The cubic root of 20407628 is about 273.2734940724.

The spelling of 20407628 in words is "twenty million, four hundred seven thousand, six hundred twenty-eight".