20421311700 has 72 divisors (see below), whose sum is σ = 59797610208. Its totient is φ = 5380065920.

The previous prime is 20421311689. The next prime is 20421311753. The reversal of 20421311700 is 711312402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385167 + ... + 434966.

It is an arithmetic number, because the mean of its divisors is an integer number (830522364).

Almost surely, 2^20421311700 is an apocalyptic number.

20421311700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421311700 is an abundant number, since it is smaller than the sum of its proper divisors (39376298508).

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

20421311700 is a wasteful number, since it uses less digits than its factorization.

20421311700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820233 (or 820226 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The spelling of 20421311700 in words is "twenty billion, four hundred twenty-one million, three hundred eleven thousand, seven hundred".