20977948 has 12 divisors (see below), whose sum is σ = 37895872. Its totient is φ = 10150560.

The previous prime is 20977889. The next prime is 20977951. The reversal of 20977948 is 84977902.

It is a junction number, because it is equal to n+sod(n) for n = 20977898 and 20977907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84465 + ... + 84712.

Almost surely, 2^20977948 is an apocalyptic number.

It is an amenable number.

20977948 is a deficient number, since it is larger than the sum of its proper divisors (16917924).

20977948 is a wasteful number, since it uses less digits than its factorization.

20977948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169212 (or 169210 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 20977948 is about 4580.1689925155. The cubic root of 20977948 is about 275.7958127108.

Subtracting from 20977948 its sum of digits (46), we obtain a palindrome (20977902).

The spelling of 20977948 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred forty-eight".