20409563394 has 24 divisors (see below), whose sum is σ = 48240786672. Its totient is φ = 6184716120.

The previous prime is 20409563371. The next prime is 20409563407. The reversal of 20409563394 is 49336590402.

20409563394 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 9 + 5 + 633 + 9 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51539104 + ... + 51539499.

It is an arithmetic number, because the mean of its divisors is an integer number (2010032778).

Almost surely, 2^20409563394 is an apocalyptic number.

20409563394 is an abundant number, since it is smaller than the sum of its proper divisors (27831223278).

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

20409563394 is a wasteful number, since it uses less digits than its factorization.

20409563394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103078622 (or 103078619 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 20409563394 in words is "twenty billion, four hundred nine million, five hundred sixty-three thousand, three hundred ninety-four".