20156423448 has 384 divisors, whose sum is σ = 64046039040. Its totient is φ = 5171040000.

The previous prime is 20156423389. The next prime is 20156423471. The reversal of 20156423448 is 84432465102.

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, 133486173 + ... + 133486323.

It is an arithmetic number, because the mean of its divisors is an integer number (166786560).

Almost surely, 2^20156423448 is an apocalyptic number.

20156423448 is a gapful number since it is divisible by the number (28) 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 20156423448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32023019520).

20156423448 is an abundant number, since it is smaller than the sum of its proper divisors (43889615592).

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

20156423448 is a wasteful number, since it uses less digits than its factorization.

20156423448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The spelling of 20156423448 in words is "twenty billion, one hundred fifty-six million, four hundred twenty-three thousand, four hundred forty-eight".