20497042272 has 192 divisors, whose sum is σ = 63643152384. Its totient is φ = 5652357120.

The previous prime is 20497042271. The next prime is 20497042283. The reversal of 20497042272 is 27224079402.

It is a self number, because there is not a number n which added to its sum of digits gives 20497042272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497042271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9519148 + ... + 9521300.

It is an arithmetic number, because the mean of its divisors is an integer number (331474752).

Almost surely, 2^20497042272 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 20497042272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31821576192).

20497042272 is an abundant number, since it is smaller than the sum of its proper divisors (43146110112).

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

20497042272 is a wasteful number, since it uses less digits than its factorization.

20497042272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2653 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 20497042272 in words is "twenty billion, four hundred ninety-seven million, forty-two thousand, two hundred seventy-two".