20477838 has 16 divisors (see below), whose sum is σ = 41650560. Its totient is φ = 6710136.

The previous prime is 20477833. The next prime is 20477881. The reversal of 20477838 is 83877402.

It is a junction number, because it is equal to n+sod(n) for n = 20477796 and 20477805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28570 + ... + 29277.

It is an arithmetic number, because the mean of its divisors is an integer number (2603160).

Almost surely, 2^20477838 is an apocalyptic number.

20477838 is an abundant number, since it is smaller than the sum of its proper divisors (21172722).

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

20477838 is a wasteful number, since it uses less digits than its factorization.

20477838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57911.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 20477838 is about 4525.2445237799. The cubic root of 20477838 is about 273.5865236086.

The spelling of 20477838 in words is "twenty million, four hundred seventy-seven thousand, eight hundred thirty-eight".