20561302 has 4 divisors (see below), whose sum is σ = 30841956. Its totient is φ = 10280650.

The previous prime is 20561291. The next prime is 20561311. The reversal of 20561302 is 20316502.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20561302.

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, 5140324 + ... + 5140327.

It is an arithmetic number, because the mean of its divisors is an integer number (7710489).

Almost surely, 2^20561302 is an apocalyptic number.

20561302 is a deficient number, since it is larger than the sum of its proper divisors (10280654).

20561302 is a wasteful number, since it uses less digits than its factorization.

20561302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280653.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20561302 is about 4534.4571891242. The cubic root of 20561302 is about 273.9577163160.

Adding to 20561302 its reverse (20316502), we get a palindrome (40877804).

The spelling of 20561302 in words is "twenty million, five hundred sixty-one thousand, three hundred two".