20401737397 has 2 divisors, whose sum is σ = 20401737398. Its totient is φ = 20401737396.

The previous prime is 20401737347. The next prime is 20401737457. The reversal of 20401737397 is 79373710402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205485316 + 196252081 = 142146^2 + 14009^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401737397 - 2¹¹ = 20401735349 is a prime.

It is a super-2 number, since 2×20401737397² (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 (20401737347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200868698 + 10200868699.

It is an arithmetic number, because the mean of its divisors is an integer number (10200868699).

Almost surely, 2^20401737397 is an apocalyptic number.

It is an amenable number.

20401737397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401737397 is an equidigital number, since it uses as much as digits as its factorization.

20401737397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 43.

The spelling of 20401737397 in words is "twenty billion, four hundred one million, seven hundred thirty-seven thousand, three hundred ninety-seven".