203478421420 has 24 divisors (see below), whose sum is σ = 427697835264. Its totient is φ = 81316482816.

The previous prime is 203478421327. The next prime is 203478421423. The reversal of 203478421420 is 24124874302.

It is a super-2 number, since 2×203478421420² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 203478421420.

It is not an unprimeable number, because it can be changed into a prime (203478421423) 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, 4658077 + ... + 4701556.

It is an arithmetic number, because the mean of its divisors is an integer number (17820743136).

Almost surely, 2^203478421420 is an apocalyptic number.

203478421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203478421420 is an abundant number, since it is smaller than the sum of its proper divisors (224219413844).

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

203478421420 is a wasteful number, since it uses less digits than its factorization.

203478421420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9360729 (or 9360727 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 37.

The spelling of 203478421420 in words is "two hundred three billion, four hundred seventy-eight million, four hundred twenty-one thousand, four hundred twenty".