20261522106 has 96 divisors (see below), whose sum is σ = 51655968000. Its totient is φ = 5619144960.

The previous prime is 20261521957. The next prime is 20261522129. The reversal of 20261522106 is 60122516202.

20261522106 is a `hidden beast` number, since 20 + 2 + 615 + 2 + 21 + 0 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20261522106.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1018180 + ... + 1037888.

It is an arithmetic number, because the mean of its divisors is an integer number (538083000).

Almost surely, 2^20261522106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20261522106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25827984000).

20261522106 is an abundant number, since it is smaller than the sum of its proper divisors (31394445894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20261522106 is a wasteful number, since it uses less digits than its factorization.

20261522106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19964 (or 19961 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 20261522106 in words is "twenty billion, two hundred sixty-one million, five hundred twenty-two thousand, one hundred six".