20910804890 has 32 divisors (see below), whose sum is σ = 39383124480. Its totient is φ = 7978823424.

The previous prime is 20910804853. The next prime is 20910804919. The reversal of 20910804890 is 9840801902.

It is a super-2 number, since 2×20910804890² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39455 + ... + 208274.

It is an arithmetic number, because the mean of its divisors is an integer number (1230722640).

Almost surely, 2^20910804890 is an apocalyptic number.

20910804890 is a deficient number, since it is larger than the sum of its proper divisors (18472319590).

20910804890 is a wasteful number, since it uses less digits than its factorization.

20910804890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248126.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 20910804890 in words is "twenty billion, nine hundred ten million, eight hundred four thousand, eight hundred ninety".