20687030 has 64 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 6459264.

The previous prime is 20687027. The next prime is 20687039. The reversal of 20687030 is 3078602.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115481 + ... + 115659.

It is an arithmetic number, because the mean of its divisors is an integer number (725760).

Almost surely, 2^20687030 is an apocalyptic number.

20687030 is an abundant number, since it is smaller than the sum of its proper divisors (25761610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20687030 is a wasteful number, since it uses less digits than its factorization.

20687030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20687030 is about 4548.2996822989. The cubic root of 20687030 is about 274.5149797787.

The spelling of 20687030 in words is "twenty million, six hundred eighty-seven thousand, thirty".