20670220557 has 48 divisors (see below), whose sum is σ = 34704633600. Its totient is φ = 11610950400.

The previous prime is 20670220553. The next prime is 20670220577. The reversal of 20670220557 is 75502207602.

20670220557 is a `hidden beast` number, since 20 + 67 + 0 + 2 + 20 + 557 = 666.

It is not a de Polignac number, because 20670220557 - 2² = 20670220553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670220553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1554457 + ... + 1567697.

It is an arithmetic number, because the mean of its divisors is an integer number (723013200).

Almost surely, 2^20670220557 is an apocalyptic number.

It is an amenable number.

20670220557 is a deficient number, since it is larger than the sum of its proper divisors (14034413043).

20670220557 is a wasteful number, since it uses less digits than its factorization.

20670220557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13674 (or 13671 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 20670220557 in words is "twenty billion, six hundred seventy million, two hundred twenty thousand, five hundred fifty-seven".