20154207240 has 512 divisors, whose sum is σ = 73023897600. Its totient is φ = 4931435520.

The previous prime is 20154207163. The next prime is 20154207277. The reversal of 20154207240 is 4270245102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 71216139 + ... + 71216421.

It is an arithmetic number, because the mean of its divisors is an integer number (142624800).

Almost surely, 2^20154207240 is an apocalyptic number.

20154207240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20154207240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36511948800).

20154207240 is an abundant number, since it is smaller than the sum of its proper divisors (52869690360).

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

20154207240 is a wasteful number, since it uses less digits than its factorization.

20154207240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The spelling of 20154207240 in words is "twenty billion, one hundred fifty-four million, two hundred seven thousand, two hundred forty".