20687950 has 12 divisors (see below), whose sum is σ = 38479680. Its totient is φ = 8275160.

The previous prime is 20687939. The next prime is 20687951. The reversal of 20687950 is 5978602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687951) 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, 206830 + ... + 206929.

It is an arithmetic number, because the mean of its divisors is an integer number (3206640).

Almost surely, 2^20687950 is an apocalyptic number.

20687950 is a deficient number, since it is larger than the sum of its proper divisors (17791730).

20687950 is a wasteful number, since it uses less digits than its factorization.

20687950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413771 (or 413766 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 20687950 is about 4548.4008178699. The cubic root of 20687950 is about 274.5190491567.

The spelling of 20687950 in words is "twenty million, six hundred eighty-seven thousand, nine hundred fifty".