20659402 has 8 divisors (see below), whose sum is σ = 31011876. Its totient is φ = 10322112.

The previous prime is 20659391. The next prime is 20659409. The reversal of 20659402 is 20495602.

It can be written as a sum of positive squares in 2 ways, for example, as 20439441 + 219961 = 4521^2 + 469^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20659409) 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, 648 + ... + 6460.

Almost surely, 2^20659402 is an apocalyptic number.

20659402 is a deficient number, since it is larger than the sum of its proper divisors (10352474).

20659402 is a wasteful number, since it uses less digits than its factorization.

20659402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20659402 is about 4545.2614886275. The cubic root of 20659402 is about 274.3927183311.

The spelling of 20659402 in words is "twenty million, six hundred fifty-nine thousand, four hundred two".