20707502155 has 8 divisors (see below), whose sum is σ = 24851360592. Its totient is φ = 16564429728.

The previous prime is 20707502147. The next prime is 20707502183. The reversal of 20707502155 is 55120570702.

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

It is a cyclic number.

It is not a de Polignac number, because 20707502155 - 2³ = 20707502147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20707502155.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136897 + ... + 245266.

It is an arithmetic number, because the mean of its divisors is an integer number (3106420074).

Almost surely, 2^20707502155 is an apocalyptic number.

20707502155 is a deficient number, since it is larger than the sum of its proper divisors (4143858437).

20707502155 is a wasteful number, since it uses less digits than its factorization.

20707502155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393005.

The product of its (nonzero) digits is 24500, while the sum is 34.

The spelling of 20707502155 in words is "twenty billion, seven hundred seven million, five hundred two thousand, one hundred fifty-five".