20470739 has 2 divisors, whose sum is σ = 20470740. Its totient is φ = 20470738.

The previous prime is 20470729. The next prime is 20470753. The reversal of 20470739 is 93707402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20470739 - 2¹² = 20466643 is a prime.

It is a super-2 number, since 2×20470739² = 838102310412242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20470729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10235369 + 10235370.

It is an arithmetic number, because the mean of its divisors is an integer number (10235370).

Almost surely, 2^20470739 is an apocalyptic number.

20470739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20470739 is an equidigital number, since it uses as much as digits as its factorization.

20470739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20470739 is about 4524.4600782856. The cubic root of 20470739 is about 273.5549054400.

The spelling of 20470739 in words is "twenty million, four hundred seventy thousand, seven hundred thirty-nine".