20207961 has 20 divisors (see below), whose sum is σ = 31502592. Its totient is φ = 12885048.

The previous prime is 20207953. The next prime is 20207969. The reversal of 20207961 is 16970202.

It is an interprime number because it is at equal distance from previous prime (20207953) and next prime (20207969).

It is not a de Polignac number, because 20207961 - 2³ = 20207953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20207969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3561 + ... + 7286.

Almost surely, 2^20207961 is an apocalyptic number.

It is an amenable number.

20207961 is a deficient number, since it is larger than the sum of its proper divisors (11294631).

20207961 is a wasteful number, since it uses less digits than its factorization.

20207961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10882 (or 10873 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20207961 is about 4495.3265732314. The cubic root of 20207961 is about 272.3793411335.

The spelling of 20207961 in words is "twenty million, two hundred seven thousand, nine hundred sixty-one".