20477420 has 12 divisors (see below), whose sum is σ = 43002624. Its totient is φ = 8190960.

The previous prime is 20477407. The next prime is 20477423. The reversal of 20477420 is 2477402.

It is a self number, because there is not a number n which added to its sum of digits gives 20477420.

It is not an unprimeable number, because it can be changed into a prime (20477423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511916 + ... + 511955.

It is an arithmetic number, because the mean of its divisors is an integer number (3583552).

Almost surely, 2^20477420 is an apocalyptic number.

20477420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20477420 is an abundant number, since it is smaller than the sum of its proper divisors (22525204).

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

20477420 is a wasteful number, since it uses less digits than its factorization.

20477420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023880 (or 1023878 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20477420 is about 4525.1983381947. The cubic root of 20477420 is about 273.5846620849.

The spelling of 20477420 in words is "twenty million, four hundred seventy-seven thousand, four hundred twenty".