20149421904 has 60 divisors (see below), whose sum is σ = 59707485396. Its totient is φ = 6321386496.

The previous prime is 20149421899. The next prime is 20149421917. The reversal of 20149421904 is 40912494102.

20149421904 is a `hidden beast` number, since 2 + 0 + 149 + 421 + 90 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16706079504 + 3443342400 = 129252^2 + 58680^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4113039 + ... + 4117934.

Almost surely, 2^20149421904 is an apocalyptic number.

20149421904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20149421904 is an abundant number, since it is smaller than the sum of its proper divisors (39558063492).

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

20149421904 is a wasteful number, since it uses less digits than its factorization.

20149421904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231004 (or 8230995 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 20149421904 in words is "twenty billion, one hundred forty-nine million, four hundred twenty-one thousand, nine hundred four".