20990948 has 24 divisors (see below), whose sum is σ = 40212480. Its totient is φ = 9508320.

The previous prime is 20990947. The next prime is 20990969. The reversal of 20990948 is 84909902.

It is not an unprimeable number, because it can be changed into a prime (20990947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15773 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (1675520).

Almost surely, 2^20990948 is an apocalyptic number.

It is an amenable number.

20990948 is a deficient number, since it is larger than the sum of its proper divisors (19221532).

20990948 is a wasteful number, since it uses less digits than its factorization.

20990948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1665 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20990948 is about 4581.5879343302. The cubic root of 20990948 is about 275.8527710178.

The spelling of 20990948 in words is "twenty million, nine hundred ninety thousand, nine hundred forty-eight".