20558420 has 24 divisors (see below), whose sum is σ = 43257984. Its totient is φ = 8207136.

The previous prime is 20558387. The next prime is 20558443. The reversal of 20558420 is 2485502.

It is a self number, because there is not a number n which added to its sum of digits gives 20558420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18809 + ... + 19871.

It is an arithmetic number, because the mean of its divisors is an integer number (1802416).

Almost surely, 2^20558420 is an apocalyptic number.

20558420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20558420 is an abundant number, since it is smaller than the sum of its proper divisors (22699564).

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

20558420 is a wasteful number, since it uses less digits than its factorization.

20558420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 20558420 is about 4534.1393891234. The cubic root of 20558420 is about 273.9449158453.

The spelling of 20558420 in words is "twenty million, five hundred fifty-eight thousand, four hundred twenty".