20153040 has 80 divisors (see below), whose sum is σ = 63049536. Its totient is φ = 5324800.

The previous prime is 20153033. The next prime is 20153047. The reversal of 20153040 is 4035102.

It is an interprime number because it is at equal distance from previous prime (20153033) and next prime (20153047).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20153040² = 812290042483200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31120 + ... + 31760.

Almost surely, 2^20153040 is an apocalyptic number.

20153040 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 20153040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31524768).

20153040 is an abundant number, since it is smaller than the sum of its proper divisors (42896496).

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

20153040 is a wasteful number, since it uses less digits than its factorization.

20153040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20153040 is about 4489.2137396208. The cubic root of 20153040 is about 272.1323606091.

Adding to 20153040 its reverse (4035102), we get a palindrome (24188142).

The spelling of 20153040 in words is "twenty million, one hundred fifty-three thousand, forty".