19954477872 has 160 divisors (see below), whose sum is σ = 69309849600. Its totient is φ = 5365896192.

The previous prime is 19954477867. The next prime is 19954477877. The reversal of 19954477872 is 27877445991.

19954477872 is a `hidden beast` number, since 1 + 9 + 9 + 544 + 7 + 7 + 87 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (19954477867) and next prime (19954477877).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19954477877) 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, 142672 + ... + 245487.

It is an arithmetic number, because the mean of its divisors is an integer number (433186560).

Almost surely, 2^19954477872 is an apocalyptic number.

19954477872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19954477872 is an abundant number, since it is smaller than the sum of its proper divisors (49355371728).

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

19954477872 is a wasteful number, since it uses less digits than its factorization.

19954477872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388200 (or 388188 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 19954477872 in words is "nineteen billion, nine hundred fifty-four million, four hundred seventy-seven thousand, eight hundred seventy-two".