20969402 has 4 divisors (see below), whose sum is σ = 31454106. Its totient is φ = 10484700.

The previous prime is 20969387. The next prime is 20969411. The reversal of 20969402 is 20496902.

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

It can be written as a sum of positive squares in only one way, i.e., 13845841 + 7123561 = 3721^2 + 2669^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5242349 + ... + 5242352.

Almost surely, 2^20969402 is an apocalyptic number.

20969402 is a deficient number, since it is larger than the sum of its proper divisors (10484704).

20969402 is a wasteful number, since it uses less digits than its factorization.

20969402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10484703.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20969402 is about 4579.2359624723. The cubic root of 20969402 is about 275.7583563757.

The spelling of 20969402 in words is "twenty million, nine hundred sixty-nine thousand, four hundred two".