208420540 has 24 divisors (see below), whose sum is σ = 438247152. Its totient is φ = 83260800.

The previous prime is 208420523. The next prime is 208420547. The reversal of 208420540 is 45024802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208420547) 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, 10240 + ... + 22840.

It is an arithmetic number, because the mean of its divisors is an integer number (18260298).

Almost surely, 2^208420540 is an apocalyptic number.

208420540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208420540 is an abundant number, since it is smaller than the sum of its proper divisors (229826612).

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

208420540 is a wasteful number, since it uses less digits than its factorization.

208420540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13437 (or 13435 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 208420540 is about 14436.7773412213. Note that the first 3 decimals coincide. The cubic root of 208420540 is about 592.8982551586.

The spelling of 208420540 in words is "two hundred eight million, four hundred twenty thousand, five hundred forty".