20154256140 has 24 divisors (see below), whose sum is σ = 56431917360. Its totient is φ = 5374468288.

The previous prime is 20154256139. The next prime is 20154256141. The reversal of 20154256140 is 4165245102.

It is an interprime number because it is at equal distance from previous prime (20154256139) and next prime (20154256141).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20154256098 and 20154256107.

It is not an unprimeable number, because it can be changed into a prime (20154256141) 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, 167952075 + ... + 167952194.

It is an arithmetic number, because the mean of its divisors is an integer number (2351329890).

Almost surely, 2^20154256140 is an apocalyptic number.

20154256140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20154256140 is an abundant number, since it is smaller than the sum of its proper divisors (36277661220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20154256140 is a wasteful number, since it uses less digits than its factorization.

20154256140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335904281 (or 335904279 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 20154256140 in words is "twenty billion, one hundred fifty-four million, two hundred fifty-six thousand, one hundred forty".