20742667 has 6 divisors (see below), whose sum is σ = 22799924. Its totient is φ = 18856860.

The previous prime is 20742653. The next prime is 20742677. The reversal of 20742667 is 76624702.

It is not a de Polignac number, because 20742667 - 2⁷ = 20742539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20742637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85593 + ... + 85834.

Almost surely, 2^20742667 is an apocalyptic number.

20742667 is a deficient number, since it is larger than the sum of its proper divisors (2057257).

20742667 is a wasteful number, since it uses less digits than its factorization.

20742667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171449 (or 171438 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20742667 is about 4554.4118171285. The cubic root of 20742667 is about 274.7608587687.

The spelling of 20742667 in words is "twenty million, seven hundred forty-two thousand, six hundred sixty-seven".