20557101540 has 48 divisors (see below), whose sum is σ = 57607385472. Its totient is φ = 5477369856.

The previous prime is 20557101463. The next prime is 20557101571. The reversal of 20557101540 is 4510175502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20557101498 and 20557101507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67744 + ... + 213783.

It is an arithmetic number, because the mean of its divisors is an integer number (1200153864).

Almost surely, 2^20557101540 is an apocalyptic number.

20557101540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20557101540 is an abundant number, since it is smaller than the sum of its proper divisors (37050283932).

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

20557101540 is a wasteful number, since it uses less digits than its factorization.

20557101540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282756 (or 282754 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

The spelling of 20557101540 in words is "twenty billion, five hundred fifty-seven million, one hundred one thousand, five hundred forty".