20154256051 has 8 divisors (see below), whose sum is σ = 20756636640. Its totient is φ = 19554910848.

The previous prime is 20154256033. The next prime is 20154256079. The reversal of 20154256051 is 15065245102.

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

It is not a de Polignac number, because 20154256051 - 2¹⁷ = 20154124979 is a prime.

It is a super-2 number, since 2×20154256051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154256651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745366 + ... + 771931.

It is an arithmetic number, because the mean of its divisors is an integer number (2594579580).

Almost surely, 2^20154256051 is an apocalyptic number.

20154256051 is a deficient number, since it is larger than the sum of its proper divisors (602380589).

20154256051 is a wasteful number, since it uses less digits than its factorization.

20154256051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517693.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 20154256051 in words is "twenty billion, one hundred fifty-four million, two hundred fifty-six thousand, fifty-one".