2020609978 has 4 divisors (see below), whose sum is σ = 3030914970. Its totient is φ = 1010304988.

The previous prime is 2020609963. The next prime is 2020609979. The reversal of 2020609978 is 8799060202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8799060202 = 2 ⋅4399530101.

It can be written as a sum of positive squares in only one way, i.e., 1849602049 + 171007929 = 43007^2 + 13077^2 .

It is not an unprimeable number, because it can be changed into a prime (2020609979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505152493 + ... + 505152496.

Almost surely, 2^2020609978 is an apocalyptic number.

2020609978 is a deficient number, since it is larger than the sum of its proper divisors (1010304992).

2020609978 is a wasteful number, since it uses less digits than its factorization.

2020609978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010304991.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 2020609978 is about 44951.1955124666. The cubic root of 2020609978 is about 1264.2340925491.

The spelling of 2020609978 in words is "two billion, twenty million, six hundred nine thousand, nine hundred seventy-eight".