20408911252 has 18 divisors (see below), whose sum is σ = 36684004938. Its totient is φ = 9927814032.

The previous prime is 20408911231. The next prime is 20408911283. The reversal of 20408911252 is 25211980402.

It can be written as a sum of positive squares in only one way, i.e., 19857319056 + 551592196 = 140916^2 + 23486^2 .

It is a super-3 number, since 3×20408911252³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1732093 + ... + 1743835.

Almost surely, 2^20408911252 is an apocalyptic number.

It is an amenable number.

20408911252 is a deficient number, since it is larger than the sum of its proper divisors (16275093686).

20408911252 is an frugal number, since it uses more digits than its factorization.

20408911252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23527 (or 11782 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 20408911252 in words is "twenty billion, four hundred eight million, nine hundred eleven thousand, two hundred fifty-two".