20472721920 has 1280 divisors, whose sum is σ = 93336883200. Its totient is φ = 4140564480.

The previous prime is 20472721897. The next prime is 20472721943. The reversal of 20472721920 is 2912727402.

It is an interprime number because it is at equal distance from previous prime (20472721897) and next prime (20472721943).

It is a tau number, because it is divible by the number of its divisors (1280).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 156280255 + ... + 156280385.

It is an arithmetic number, because the mean of its divisors is an integer number (72919440).

Almost surely, 2^20472721920 is an apocalyptic number.

20472721920 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 20472721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46668441600).

20472721920 is an abundant number, since it is smaller than the sum of its proper divisors (72864161280).

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

20472721920 is a wasteful number, since it uses less digits than its factorization.

20472721920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 20472721920 in words is "twenty billion, four hundred seventy-two million, seven hundred twenty-one thousand, nine hundred twenty".