20545446642 has 32 divisors (see below), whose sum is σ = 46997241984. Its totient is φ = 5865600000.

The previous prime is 20545446637. The next prime is 20545446689. The reversal of 20545446642 is 24664454502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20545446594 and 20545446603.

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, 133359 + ... + 242642.

It is an arithmetic number, because the mean of its divisors is an integer number (1468663812).

Almost surely, 2^20545446642 is an apocalyptic number.

20545446642 is an abundant number, since it is smaller than the sum of its proper divisors (26451795342).

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

20545446642 is a wasteful number, since it uses less digits than its factorization.

20545446642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377314.

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 20545446642 in words is "twenty billion, five hundred forty-five million, four hundred forty-six thousand, six hundred forty-two".