20154057780 has 48 divisors (see below), whose sum is σ = 57632037120. Its totient is φ = 5260065408.

The previous prime is 20154057697. The next prime is 20154057823. The reversal of 20154057780 is 8775045102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3570595 + ... + 3576234.

It is an arithmetic number, because the mean of its divisors is an integer number (1200667440).

Almost surely, 2^20154057780 is an apocalyptic number.

20154057780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20154057780 is an abundant number, since it is smaller than the sum of its proper divisors (37477979340).

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

20154057780 is a wasteful number, since it uses less digits than its factorization.

20154057780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146888 (or 7146886 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 20154057780 in words is "twenty billion, one hundred fifty-four million, fifty-seven thousand, seven hundred eighty".