20561562334 has 4 divisors (see below), whose sum is σ = 30842343504. Its totient is φ = 10280781166.

The previous prime is 20561562323. The next prime is 20561562341. The reversal of 20561562334 is 43326516502.

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

It is a super-2 number, since 2×20561562334² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20561562293 and 20561562302.

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, 5140390582 + ... + 5140390585.

It is an arithmetic number, because the mean of its divisors is an integer number (7710585876).

Almost surely, 2^20561562334 is an apocalyptic number.

20561562334 is a deficient number, since it is larger than the sum of its proper divisors (10280781170).

20561562334 is a wasteful number, since it uses less digits than its factorization.

20561562334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280781169.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20561562334 in words is "twenty billion, five hundred sixty-one million, five hundred sixty-two thousand, three hundred thirty-four".