206347981940 has 24 divisors (see below), whose sum is σ = 433350957312. Its totient is φ = 82535346080.

The previous prime is 206347981927. The next prime is 206347981949. The reversal of 206347981940 is 49189743602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206347981949) 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, 221057 + ... + 679383.

It is an arithmetic number, because the mean of its divisors is an integer number (18056289888).

Almost surely, 2^206347981940 is an apocalyptic number.

206347981940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206347981940 is an abundant number, since it is smaller than the sum of its proper divisors (227002975372).

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

206347981940 is a wasteful number, since it uses less digits than its factorization.

206347981940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480847 (or 480845 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 206347981940 in words is "two hundred six billion, three hundred forty-seven million, nine hundred eighty-one thousand, nine hundred forty".