20238379477 has 2 divisors, whose sum is σ = 20238379478. Its totient is φ = 20238379476.

The previous prime is 20238379471. The next prime is 20238379517. The reversal of 20238379477 is 77497383202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19950432516 + 287946961 = 141246^2 + 16969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20238379477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20238379471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10119189738 + 10119189739.

It is an arithmetic number, because the mean of its divisors is an integer number (10119189739).

Almost surely, 2^20238379477 is an apocalyptic number.

It is an amenable number.

20238379477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20238379477 is an equidigital number, since it uses as much as digits as its factorization.

20238379477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 52.

The spelling of 20238379477 in words is "twenty billion, two hundred thirty-eight million, three hundred seventy-nine thousand, four hundred seventy-seven".