20021769890 has 64 divisors (see below), whose sum is σ = 38528784000. Its totient is φ = 7464877056.

The previous prime is 20021769881. The next prime is 20021769991. The reversal of 20021769890 is 9896712002.

It is a happy number.

It is a super-2 number, since 2×20021769890² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12924836 + ... + 12926384.

It is an arithmetic number, because the mean of its divisors is an integer number (602012250).

Almost surely, 2^20021769890 is an apocalyptic number.

20021769890 is a deficient number, since it is larger than the sum of its proper divisors (18507014110).

20021769890 is a wasteful number, since it uses less digits than its factorization.

20021769890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 20021769890 in words is "twenty billion, twenty-one million, seven hundred sixty-nine thousand, eight hundred ninety".