20256751 has 2 divisors, whose sum is σ = 20256752. Its totient is φ = 20256750.

The previous prime is 20256737. The next prime is 20256763. The reversal of 20256751 is 15765202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20256751 - 2¹³ = 20248559 is a prime.

It is a super-2 number, since 2×20256751² = 820671922152002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20256151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128375 + 10128376.

It is an arithmetic number, because the mean of its divisors is an integer number (10128376).

Almost surely, 2^20256751 is an apocalyptic number.

20256751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20256751 is an equidigital number, since it uses as much as digits as its factorization.

20256751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20256751 is about 4500.7500486030. The cubic root of 20256751 is about 272.5983753893.

It can be divided in two parts, 202 and 56751, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 20256751 in words is "twenty million, two hundred fifty-six thousand, seven hundred fifty-one".