20387980800 has 960 divisors, whose sum is σ = 84757432320. Its totient is φ = 4755456000.

The previous prime is 20387980787. The next prime is 20387980841. The reversal of 20387980800 is 808978302.

It is a tau number, because it is divible by the number of its divisors (960).

It is a super-2 number, since 2×20387980800² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 117849514 + ... + 117849686.

It is an arithmetic number, because the mean of its divisors is an integer number (88288992).

Almost surely, 2^20387980800 is an apocalyptic number.

20387980800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20387980800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42378716160).

20387980800 is an abundant number, since it is smaller than the sum of its proper divisors (64369451520).

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

20387980800 is a wasteful number, since it uses less digits than its factorization.

20387980800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 20387980800 in words is "twenty billion, three hundred eighty-seven million, nine hundred eighty thousand, eight hundred".