20909402 has 8 divisors (see below), whose sum is σ = 31552416. Its totient is φ = 10391932.

The previous prime is 20909389. The next prime is 20909419. The reversal of 20909402 is 20490902.

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, 30968 + ... + 31635.

It is an arithmetic number, because the mean of its divisors is an integer number (3944052).

Almost surely, 2^20909402 is an apocalyptic number.

20909402 is a deficient number, since it is larger than the sum of its proper divisors (10643014).

20909402 is a wasteful number, since it uses less digits than its factorization.

20909402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62772.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20909402 is about 4572.6799581864. The cubic root of 20909402 is about 275.4950949003.

The spelling of 20909402 in words is "twenty million, nine hundred nine thousand, four hundred two".