20900477 has 16 divisors (see below), whose sum is σ = 23331840. Its totient is φ = 18600192.

The previous prime is 20900471. The next prime is 20900489. The reversal of 20900477 is 77400902.

It is not a de Polignac number, because 20900477 - 2⁴ = 20900461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48053 + ... + 48485.

It is an arithmetic number, because the mean of its divisors is an integer number (1458240).

Almost surely, 2^20900477 is an apocalyptic number.

It is an amenable number.

20900477 is a deficient number, since it is larger than the sum of its proper divisors (2431363).

20900477 is a wasteful number, since it uses less digits than its factorization.

20900477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20900477 is about 4571.7039492951. The cubic root of 20900477 is about 275.4558917443.

The spelling of 20900477 in words is "twenty million, nine hundred thousand, four hundred seventy-seven".