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20962691 = 107195913
BaseRepresentation
bin100111111110…
…1110110000011
31110110000101222
41033331312003
520331301231
62025145255
7343115501
oct117756603
943400358
1020962691
1110918642
12702b22b
13445c679
142ad9671
151c9127b
hex13fdd83

20962691 has 4 divisors (see below), whose sum is σ = 21158712. Its totient is φ = 20766672.

The previous prime is 20962687. The next prime is 20962703. The reversal of 20962691 is 19626902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19626902 = 29813451.

It is a cyclic number.

It is not a de Polignac number, because 20962691 - 22 = 20962687 is a prime.

It is a super-2 number, since 2×209626912 = 878868827922962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20962631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97850 + ... + 98063.

It is an arithmetic number, because the mean of its divisors is an integer number (5289678).

Almost surely, 220962691 is an apocalyptic number.

20962691 is a deficient number, since it is larger than the sum of its proper divisors (196021).

20962691 is a wasteful number, since it uses less digits than its factorization.

20962691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196020.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20962691 is about 4578.5031396735. The cubic root of 20962691 is about 275.7289355433.

The spelling of 20962691 in words is "twenty million, nine hundred sixty-two thousand, six hundred ninety-one".

Divisors: 1 107 195913 20962691