20864148720 has 40 divisors (see below), whose sum is σ = 64678861776. Its totient is φ = 5563772928.

The previous prime is 20864148703. The next prime is 20864148731. The reversal of 20864148720 is 2784146802.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43466737 + ... + 43467216.

Almost surely, 2^20864148720 is an apocalyptic number.

20864148720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20864148720 is an abundant number, since it is smaller than the sum of its proper divisors (43814713056).

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

20864148720 is a wasteful number, since it uses less digits than its factorization.

20864148720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86933969 (or 86933963 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The spelling of 20864148720 in words is "twenty billion, eight hundred sixty-four million, one hundred forty-eight thousand, seven hundred twenty".