20909302 has 4 divisors (see below), whose sum is σ = 31363956. Its totient is φ = 10454650.

The previous prime is 20909297. The next prime is 20909311. The reversal of 20909302 is 20390902.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5227324 + ... + 5227327.

It is an arithmetic number, because the mean of its divisors is an integer number (7840989).

Almost surely, 2^20909302 is an apocalyptic number.

20909302 is a deficient number, since it is larger than the sum of its proper divisors (10454654).

20909302 is a wasteful number, since it uses less digits than its factorization.

20909302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454653.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20909302 is about 4572.6690236666. The cubic root of 20909302 is about 275.4946557110.

Subtracting from 20909302 its reverse (20390902), we obtain a square (518400 = 720²).

The spelling of 20909302 in words is "twenty million, nine hundred nine thousand, three hundred two".