20976538 has 16 divisors (see below), whose sum is σ = 36345024. Its totient is φ = 8973760.

The previous prime is 20976511. The next prime is 20976539. The reversal of 20976538 is 83567902.

It is a self number, because there is not a number n which added to its sum of digits gives 20976538.

It is not an unprimeable number, because it can be changed into a prime (20976539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27670 + ... + 28417.

It is an arithmetic number, because the mean of its divisors is an integer number (2271564).

Almost surely, 2^20976538 is an apocalyptic number.

20976538 is a deficient number, since it is larger than the sum of its proper divisors (15368486).

20976538 is a wasteful number, since it uses less digits than its factorization.

20976538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56117.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20976538 is about 4580.0150654774. The cubic root of 20976538 is about 275.7896335108.

The spelling of 20976538 in words is "twenty million, nine hundred seventy-six thousand, five hundred thirty-eight".