20404747 has 16 divisors (see below), whose sum is σ = 22999680. Its totient is φ = 17942400.

The previous prime is 20404739. The next prime is 20404753. The reversal of 20404747 is 74740402.

It is a cyclic number.

It is not a de Polignac number, because 20404747 - 2³ = 20404739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20404717) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 84547 + ... + 84787.

It is an arithmetic number, because the mean of its divisors is an integer number (1437480).

Almost surely, 2^20404747 is an apocalyptic number.

20404747 is a deficient number, since it is larger than the sum of its proper divisors (2594933).

20404747 is a wasteful number, since it uses less digits than its factorization.

20404747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 20404747 is about 4517.1613874202. The cubic root of 20404747 is about 273.2606338813.

The spelling of 20404747 in words is "twenty million, four hundred four thousand, seven hundred forty-seven".