20611537074 has 96 divisors (see below), whose sum is σ = 47604637440. Its totient is φ = 6607526112.

The previous prime is 20611537073. The next prime is 20611537123. The reversal of 20611537074 is 47073511602.

It is a happy number.

20611537074 is a `hidden beast` number, since 2 + 0 + 611 + 5 + 37 + 0 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (20611537073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8833612 + ... + 8835944.

It is an arithmetic number, because the mean of its divisors is an integer number (495881640).

Almost surely, 2^20611537074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20611537074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23802318720).

20611537074 is an abundant number, since it is smaller than the sum of its proper divisors (26993100366).

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

20611537074 is a wasteful number, since it uses less digits than its factorization.

20611537074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

It can be divided in two parts, 2061 and 1537074, that added together give a triangular number (1539135 = T₁₇₅₄).

The spelling of 20611537074 in words is "twenty billion, six hundred eleven million, five hundred thirty-seven thousand, seventy-four".