20629997 has 2 divisors, whose sum is σ = 20629998. Its totient is φ = 20629996.

The previous prime is 20629969. The next prime is 20630003. The reversal of 20629997 is 79992602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 7806436 = 3581^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 20629997 - 2²² = 16435693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20629907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314998 + 10314999.

It is an arithmetic number, because the mean of its divisors is an integer number (10314999).

Almost surely, 2^20629997 is an apocalyptic number.

It is an amenable number.

20629997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629997 is an equidigital number, since it uses as much as digits as its factorization.

20629997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 20629997 is about 4542.0256494212. The cubic root of 20629997 is about 274.2624733713.

It can be divided in two parts, 206 and 29997, that added together give a palindrome (30203).

The spelling of 20629997 in words is "twenty million, six hundred twenty-nine thousand, nine hundred ninety-seven".