20977750 has 16 divisors (see below), whose sum is σ = 39270816. Its totient is φ = 8391000.

The previous prime is 20977709. The next prime is 20977753. The reversal of 20977750 is 5777902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977753) 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, 41706 + ... + 42205.

It is an arithmetic number, because the mean of its divisors is an integer number (2454426).

Almost surely, 2^20977750 is an apocalyptic number.

20977750 is a deficient number, since it is larger than the sum of its proper divisors (18293066).

20977750 is an equidigital number, since it uses as much as digits as its factorization.

20977750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83928 (or 83918 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 20977750 is about 4580.1473775415. The cubic root of 20977750 is about 275.7949450100.

The spelling of 20977750 in words is "twenty million, nine hundred seventy-seven thousand, seven hundred fifty".