20769651 has 12 divisors (see below), whose sum is σ = 34286512. Its totient is φ = 11868336.

The previous prime is 20769649. The next prime is 20769689. The reversal of 20769651 is 15696702.

It is not a de Polignac number, because 20769651 - 2¹ = 20769649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20769251) 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, 164776 + ... + 164901.

Almost surely, 2^20769651 is an apocalyptic number.

20769651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20769651 is a deficient number, since it is larger than the sum of its proper divisors (13516861).

20769651 is a wasteful number, since it uses less digits than its factorization.

20769651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329690 (or 329687 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20769651 is about 4557.3732566030. The cubic root of 20769651 is about 274.8799520098.

The spelling of 20769651 in words is "twenty million, seven hundred sixty-nine thousand, six hundred fifty-one".