20740977 has 6 divisors (see below), whose sum is σ = 29959202. Its totient is φ = 13827312.

The previous prime is 20740939. The next prime is 20740981. The reversal of 20740977 is 77904702.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 1766241 = 4356^2 + 1329^2 .

It is not a de Polignac number, because 20740977 - 2⁷ = 20740849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20740927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1152268 + ... + 1152285.

Almost surely, 2^20740977 is an apocalyptic number.

It is an amenable number.

20740977 is a deficient number, since it is larger than the sum of its proper divisors (9218225).

20740977 is a wasteful number, since it uses less digits than its factorization.

20740977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304559 (or 2304556 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20740977 is about 4554.2262789633. The cubic root of 20740977 is about 274.7533965578.

The spelling of 20740977 in words is "twenty million, seven hundred forty thousand, nine hundred seventy-seven".