20402651042 has 8 divisors (see below), whose sum is σ = 30874808556. Its totient is φ = 10111048192.

The previous prime is 20402650991. The next prime is 20402651069. The reversal of 20402651042 is 24015620402.

It can be written as a sum of positive squares in 2 ways, for example, as 14381046241 + 6021604801 = 119921^2 + 77599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45138383 + ... + 45138834.

Almost surely, 2^20402651042 is an apocalyptic number.

20402651042 is a deficient number, since it is larger than the sum of its proper divisors (10472157514).

20402651042 is a wasteful number, since it uses less digits than its factorization.

20402651042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90277332.

The product of its (nonzero) digits is 3840, while the sum is 26.

The spelling of 20402651042 in words is "twenty billion, four hundred two million, six hundred fifty-one thousand, forty-two".