20797986 has 32 divisors (see below), whose sum is σ = 45654336. Its totient is φ = 6264000.

The previous prime is 20797981. The next prime is 20797999. The reversal of 20797986 is 68979702.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20797981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11076 + ... + 12816.

It is an arithmetic number, because the mean of its divisors is an integer number (1426698).

Almost surely, 2^20797986 is an apocalyptic number.

20797986 is an abundant number, since it is smaller than the sum of its proper divisors (24856350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20797986 is a wasteful number, since it uses less digits than its factorization.

20797986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 20797986 is about 4560.4808956951. The cubic root of 20797986 is about 275.0048968825.

The spelling of 20797986 in words is "twenty million, seven hundred ninety-seven thousand, nine hundred eighty-six".