20977325428 has 6 divisors (see below), whose sum is σ = 36710319506. Its totient is φ = 10488662712.

The previous prime is 20977325387. The next prime is 20977325437. The reversal of 20977325428 is 82452377902.

It can be written as a sum of positive squares in only one way, i.e., 19536211984 + 1441113444 = 139772^2 + 37962^2 .

It is a super-2 number, since 2×20977325428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2622165675 + ... + 2622165682.

Almost surely, 2^20977325428 is an apocalyptic number.

It is an amenable number.

20977325428 is a deficient number, since it is larger than the sum of its proper divisors (15732994078).

20977325428 is a wasteful number, since it uses less digits than its factorization.

20977325428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244331361 (or 5244331359 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 20977325428 in words is "twenty billion, nine hundred seventy-seven million, three hundred twenty-five thousand, four hundred twenty-eight".