20420902373 has 2 divisors, whose sum is σ = 20420902374. Its totient is φ = 20420902372.

The previous prime is 20420902361. The next prime is 20420902387. The reversal of 20420902373 is 37320902402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19345193569 + 1075708804 = 139087^2 + 32798^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420902373 - 2¹⁰ = 20420901349 is a prime.

It is a super-2 number, since 2×20420902373² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420932373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210451186 + 10210451187.

It is an arithmetic number, because the mean of its divisors is an integer number (10210451187).

Almost surely, 2^20420902373 is an apocalyptic number.

It is an amenable number.

20420902373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420902373 is an equidigital number, since it uses as much as digits as its factorization.

20420902373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The spelling of 20420902373 in words is "twenty billion, four hundred twenty million, nine hundred two thousand, three hundred seventy-three".