20178342890 has 16 divisors (see below), whose sum is σ = 36476905608. Its totient is φ = 8036695296.

The previous prime is 20178342887. The next prime is 20178342913. The reversal of 20178342890 is 9824387102.

It can be written as a sum of positive squares in 4 ways, for example, as 10241642401 + 9936700489 = 101201^2 + 99683^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327787 + ... + 4332446.

Almost surely, 2^20178342890 is an apocalyptic number.

20178342890 is a deficient number, since it is larger than the sum of its proper divisors (16298562718).

20178342890 is a wasteful number, since it uses less digits than its factorization.

20178342890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8660473.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 20178342890 in words is "twenty billion, one hundred seventy-eight million, three hundred forty-two thousand, eight hundred ninety".