20787402 has 8 divisors (see below), whose sum is σ = 41574816. Its totient is φ = 6929132.

The previous prime is 20787401. The next prime is 20787409. The reversal of 20787402 is 20478702.

It is a sphenic number, since it is the product of 3 distinct primes.

20787402 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20787402.

It is not an unprimeable number, because it can be changed into a prime (20787401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1732278 + ... + 1732289.

It is an arithmetic number, because the mean of its divisors is an integer number (5196852).

Almost surely, 2^20787402 is an apocalyptic number.

20787402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20787402 is a wasteful number, since it uses less digits than its factorization.

20787402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464572.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20787402 is about 4559.3203440864. The cubic root of 20787402 is about 274.9582393887.

The spelling of 20787402 in words is "twenty million, seven hundred eighty-seven thousand, four hundred two".