20400231029 has 2 divisors, whose sum is σ = 20400231030. Its totient is φ = 20400231028.

The previous prime is 20400231023. The next prime is 20400231121. The reversal of 20400231029 is 92013200402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18667756900 + 1732474129 = 136630^2 + 41623^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400231029 - 2¹⁶ = 20400165493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20400230995 and 20400231013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400231023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200115514 + 10200115515.

It is an arithmetic number, because the mean of its divisors is an integer number (10200115515).

Almost surely, 2^20400231029 is an apocalyptic number.

It is an amenable number.

20400231029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400231029 is an equidigital number, since it uses as much as digits as its factorization.

20400231029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 20400231029 in words is "twenty billion, four hundred million, two hundred thirty-one thousand, twenty-nine".