20477929 has 2 divisors, whose sum is σ = 20477930. Its totient is φ = 20477928.

The previous prime is 20477927. The next prime is 20477957. The reversal of 20477929 is 92977402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 2304 = 4525^2 + 48^2 .

It is a cyclic number.

It is not a de Polignac number, because 20477929 - 2¹ = 20477927 is a prime.

It is a super-2 number, since 2×20477929² = 838691152258082, which contains 22 as substring.

Together with 20477927, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1298947 and since 20477929 and 1298947 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20477891 and 20477900.

It is not a weakly prime, because it can be changed into another prime (20477923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238964 + 10238965.

It is an arithmetic number, because the mean of its divisors is an integer number (10238965).

Almost surely, 2^20477929 is an apocalyptic number.

It is an amenable number.

20477929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20477929 is an equidigital number, since it uses as much as digits as its factorization.

20477929 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20477929 is about 4525.2545784740. The cubic root of 20477929 is about 273.5869288652.

The spelling of 20477929 in words is "twenty million, four hundred seventy-seven thousand, nine hundred twenty-nine".