20477856 has 96 divisors (see below), whose sum is σ = 63479808. Its totient is φ = 5656320.

The previous prime is 20477833. The next prime is 20477881. The reversal of 20477856 is 65877402.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20341 + ... + 21323.

It is an arithmetic number, because the mean of its divisors is an integer number (661248).

Almost surely, 2^20477856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20477856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31739904).

20477856 is an abundant number, since it is smaller than the sum of its proper divisors (43001952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20477856 is a wasteful number, since it uses less digits than its factorization.

20477856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20477856 is about 4525.2465126223. The cubic root of 20477856 is about 273.5866037694.

The spelling of 20477856 in words is "twenty million, four hundred seventy-seven thousand, eight hundred fifty-six".