20723374501 has 2 divisors, whose sum is σ = 20723374502. Its totient is φ = 20723374500.

The previous prime is 20723374487. The next prime is 20723374531. The reversal of 20723374501 is 10547332702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18858430276 + 1864944225 = 137326^2 + 43185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20723374501 - 2⁹ = 20723373989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20723374531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361687250 + 10361687251.

It is an arithmetic number, because the mean of its divisors is an integer number (10361687251).

Almost surely, 2^20723374501 is an apocalyptic number.

It is an amenable number.

20723374501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723374501 is an equidigital number, since it uses as much as digits as its factorization.

20723374501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 34.

The spelling of 20723374501 in words is "twenty billion, seven hundred twenty-three million, three hundred seventy-four thousand, five hundred one".