20868693420 has 24 divisors (see below), whose sum is σ = 58432341744. Its totient is φ = 5564984896.

The previous prime is 20868693407. The next prime is 20868693421. The reversal of 20868693420 is 2439686802.

It is a self number, because there is not a number n which added to its sum of digits gives 20868693420.

It is not an unprimeable number, because it can be changed into a prime (20868693421) 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, 173905719 + ... + 173905838.

It is an arithmetic number, because the mean of its divisors is an integer number (2434680906).

Almost surely, 2^20868693420 is an apocalyptic number.

20868693420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20868693420 is an abundant number, since it is smaller than the sum of its proper divisors (37563648324).

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

20868693420 is a wasteful number, since it uses less digits than its factorization.

20868693420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347811569 (or 347811567 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 20868693420 in words is "twenty billion, eight hundred sixty-eight million, six hundred ninety-three thousand, four hundred twenty".