20974311 has 12 divisors (see below), whose sum is σ = 32078592. Its totient is φ = 13160256.

The previous prime is 20974307. The next prime is 20974319. The reversal of 20974311 is 11347902.

It is not a de Polignac number, because 20974311 - 2² = 20974307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68391 + ... + 68696.

It is an arithmetic number, because the mean of its divisors is an integer number (2673216).

Almost surely, 2^20974311 is an apocalyptic number.

20974311 is a deficient number, since it is larger than the sum of its proper divisors (11104281).

20974311 is a wasteful number, since it uses less digits than its factorization.

20974311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137110 (or 137107 counting only the distinct ones).

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

The square root of 20974311 is about 4579.7719375532. The cubic root of 20974311 is about 275.7798733166.

The spelling of 20974311 in words is "twenty million, nine hundred seventy-four thousand, three hundred eleven".