20607551 has 2 divisors, whose sum is σ = 20607552. Its totient is φ = 20607550.

The previous prime is 20607547. The next prime is 20607581. The reversal of 20607551 is 15570602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20607551 - 2² = 20607547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20607551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20607511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10303775 + 10303776.

It is an arithmetic number, because the mean of its divisors is an integer number (10303776).

Almost surely, 2^20607551 is an apocalyptic number.

20607551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20607551 is an equidigital number, since it uses as much as digits as its factorization.

20607551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20607551 is about 4539.5540529880. The cubic root of 20607551 is about 274.1629689216.

The spelling of 20607551 in words is "twenty million, six hundred seven thousand, five hundred fifty-one".