20920402 has 8 divisors (see below), whose sum is σ = 31412736. Its totient is φ = 10449492.

The previous prime is 20920391. The next prime is 20920411. The reversal of 20920402 is 20402902.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20920402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2638 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (3926592).

Almost surely, 2^20920402 is an apocalyptic number.

20920402 is a deficient number, since it is larger than the sum of its proper divisors (10492334).

20920402 is a wasteful number, since it uses less digits than its factorization.

20920402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20920402 is about 4573.8825957823. The cubic root of 20920402 is about 275.5433971709.

The spelling of 20920402 in words is "twenty million, nine hundred twenty thousand, four hundred two".