20516051642 has 32 divisors (see below), whose sum is σ = 31866996672. Its totient is φ = 9900468864.

The previous prime is 20516051617. The next prime is 20516051657. The reversal of 20516051642 is 24615061502.

It is a junction number, because it is equal to n+sod(n) for n = 20516051599 and 20516051608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6653033 + ... + 6656115.

It is an arithmetic number, because the mean of its divisors is an integer number (995843646).

Almost surely, 2^20516051642 is an apocalyptic number.

20516051642 is a deficient number, since it is larger than the sum of its proper divisors (11350945030).

20516051642 is a wasteful number, since it uses less digits than its factorization.

20516051642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 20516051642 in words is "twenty billion, five hundred sixteen million, fifty-one thousand, six hundred forty-two".