20477666442 has 32 divisors (see below), whose sum is σ = 43157505600. Its totient is φ = 6459637248.

The previous prime is 20477666401. The next prime is 20477666477. The reversal of 20477666442 is 24466677402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20477666391 and 20477666400.

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, 9228 + ... + 202584.

It is an arithmetic number, because the mean of its divisors is an integer number (1348672050).

Almost surely, 2^20477666442 is an apocalyptic number.

20477666442 is an abundant number, since it is smaller than the sum of its proper divisors (22679839158).

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

20477666442 is a wasteful number, since it uses less digits than its factorization.

20477666442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194310.

The product of its (nonzero) digits is 2709504, while the sum is 48.

The spelling of 20477666442 in words is "twenty billion, four hundred seventy-seven million, six hundred sixty-six thousand, four hundred forty-two".