20390715072 has 336 divisors, whose sum is σ = 72932991040. Its totient is φ = 5304102912.

The previous prime is 20390715053. The next prime is 20390715073. The reversal of 20390715072 is 27051709302.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×20390715072² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20390715073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 279324828 + ... + 279324900.

Almost surely, 2^20390715072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390715072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36466495520).

20390715072 is an abundant number, since it is smaller than the sum of its proper divisors (52542275968).

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

20390715072 is an frugal number, since it uses more digits than its factorization.

20390715072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 20390715072 in words is "twenty billion, three hundred ninety million, seven hundred fifteen thousand, seventy-two".