20402023655 has 16 divisors (see below), whose sum is σ = 26460898464. Its totient is φ = 15011706240.

The previous prime is 20402023643. The next prime is 20402023667. The reversal of 20402023655 is 55632020402.

It is an interprime number because it is at equal distance from previous prime (20402023643) and next prime (20402023667).

It is not a de Polignac number, because 20402023655 - 2⁴ = 20402023639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548561 + ... + 584570.

It is an arithmetic number, because the mean of its divisors is an integer number (1653806154).

Almost surely, 2^20402023655 is an apocalyptic number.

20402023655 is a deficient number, since it is larger than the sum of its proper divisors (6058874809).

20402023655 is a wasteful number, since it uses less digits than its factorization.

20402023655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133426.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 20402023655 in words is "twenty billion, four hundred two million, twenty-three thousand, six hundred fifty-five".