20501977104 has 120 divisors (see below), whose sum is σ = 66912185600. Its totient is φ = 5857693632.

The previous prime is 20501977103. The next prime is 20501977117. The reversal of 20501977104 is 40177910502.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20501977103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158152 + ... + 256935.

Almost surely, 2^20501977104 is an apocalyptic number.

20501977104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20501977104 is an abundant number, since it is smaller than the sum of its proper divisors (46410208496).

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

20501977104 is a wasteful number, since it uses less digits than its factorization.

20501977104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415122 (or 415099 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 20501977104 in words is "twenty billion, five hundred one million, nine hundred seventy-seven thousand, one hundred four".