20708961 has 32 divisors (see below), whose sum is σ = 35094528. Its totient is φ = 10566720.

The previous prime is 20708957. The next prime is 20708969. The reversal of 20708961 is 16980702.

It is not a de Polignac number, because 20708961 - 2² = 20708957 is a prime.

It is a super-2 number, since 2×20708961² = 857722131399042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20708969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7240 + ... + 9686.

It is an arithmetic number, because the mean of its divisors is an integer number (1096704).

Almost surely, 2^20708961 is an apocalyptic number.

20708961 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20708961 is a deficient number, since it is larger than the sum of its proper divisors (14385567).

20708961 is a wasteful number, since it uses less digits than its factorization.

20708961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20708961 is about 4550.7099446130. The cubic root of 20708961 is about 274.6119529676.

The spelling of 20708961 in words is "twenty million, seven hundred eight thousand, nine hundred sixty-one".