20163904425 has 192 divisors, whose sum is σ = 45010690560. Its totient is φ = 8639447040.

The previous prime is 20163904417. The next prime is 20163904499. The reversal of 20163904425 is 52440936102.

It is a happy number.

20163904425 is a `hidden beast` number, since 201 + 6 + 3 + 9 + 0 + 442 + 5 = 666.

It is not a de Polignac number, because 20163904425 - 2³ = 20163904417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20163904425.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 29960889 + ... + 29961561.

It is an arithmetic number, because the mean of its divisors is an integer number (234430680).

Almost surely, 2^20163904425 is an apocalyptic number.

20163904425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20163904425 is an abundant number, since it is smaller than the sum of its proper divisors (24846786135).

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

20163904425 is a wasteful number, since it uses less digits than its factorization.

20163904425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20163904425 in words is "twenty billion, one hundred sixty-three million, nine hundred four thousand, four hundred twenty-five".