20151540020 has 24 divisors (see below), whose sum is σ = 42486843168. Its totient is φ = 8028500000.

The previous prime is 20151540007. The next prime is 20151540023. The reversal of 20151540020 is 2004515102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20151539974 and 20151540001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151540023) 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, 2002106 + ... + 2012145.

It is an arithmetic number, because the mean of its divisors is an integer number (1770285132).

Almost surely, 2^20151540020 is an apocalyptic number.

20151540020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20151540020 is an abundant number, since it is smaller than the sum of its proper divisors (22335303148).

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

20151540020 is a wasteful number, since it uses less digits than its factorization.

20151540020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014511 (or 4014509 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 20151540020 in words is "twenty billion, one hundred fifty-one million, five hundred forty thousand, twenty".