20941977 has 16 divisors (see below), whose sum is σ = 33789312. Its totient is φ = 11262720.

The previous prime is 20941927. The next prime is 20941981. The reversal of 20941977 is 77914902.

It is not a de Polignac number, because 20941977 - 2⁶ = 20941913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20941927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28974 + ... + 29687.

It is an arithmetic number, because the mean of its divisors is an integer number (2111832).

Almost surely, 2^20941977 is an apocalyptic number.

It is an amenable number.

20941977 is a deficient number, since it is larger than the sum of its proper divisors (12847335).

20941977 is a wasteful number, since it uses less digits than its factorization.

20941977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58688.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 20941977 is about 4576.2404875618. The cubic root of 20941977 is about 275.6380863383.

The spelling of 20941977 in words is "twenty million, nine hundred forty-one thousand, nine hundred seventy-seven".