20402930 has 8 divisors (see below), whose sum is σ = 36725292. Its totient is φ = 8161168.

The previous prime is 20402927. The next prime is 20402951. The reversal of 20402930 is 3920402.

It can be written as a sum of positive squares in 2 ways, for example, as 16834609 + 3568321 = 4103^2 + 1889^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020137 + ... + 1020156.

Almost surely, 2^20402930 is an apocalyptic number.

20402930 is a deficient number, since it is larger than the sum of its proper divisors (16322362).

20402930 is a wasteful number, since it uses less digits than its factorization.

20402930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040300.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20402930 is about 4516.9602610605. The cubic root of 20402930 is about 273.2525225447.

The spelling of 20402930 in words is "twenty million, four hundred two thousand, nine hundred thirty".