20897954112 has 224 divisors, whose sum is σ = 66133049344. Its totient is φ = 5698252800.

The previous prime is 20897954101. The next prime is 20897954131. The reversal of 20897954112 is 21145979802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3038037 + ... + 3044907.

Almost surely, 2^20897954112 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 20897954112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33066524672).

20897954112 is an abundant number, since it is smaller than the sum of its proper divisors (45235095232).

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

20897954112 is a wasteful number, since it uses less digits than its factorization.

20897954112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997 (or 6987 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 20897954112 in words is "twenty billion, eight hundred ninety-seven million, nine hundred fifty-four thousand, one hundred twelve".