20274979 has 2 divisors, whose sum is σ = 20274980. Its totient is φ = 20274978.

The previous prime is 20274971. The next prime is 20275007. The reversal of 20274979 is 97947202.

20274979 = T₃₆₇₅ + T₃₆₇₆ + T₃₆₇₇.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20274979 - 2³ = 20274971 is a prime.

It is a super-2 number, since 2×20274979² = 822149546900882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20274971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10137489 + 10137490.

It is an arithmetic number, because the mean of its divisors is an integer number (10137490).

Almost surely, 2^20274979 is an apocalyptic number.

20274979 is the 3677-th centered triangular number.

20274979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20274979 is an equidigital number, since it uses as much as digits as its factorization.

20274979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 20274979 is about 4502.7745890728. The cubic root of 20274979 is about 272.6801165910.

The spelling of 20274979 in words is "twenty million, two hundred seventy-four thousand, nine hundred seventy-nine".